Journals >Acta Photonica Sinica
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2009
Volume: 38 Issue 12
59 Article(s)
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Research Article
473 nm Single-frequency Operation of Corner Cube Based Solid-state Non-planar Ring Cavity
GONG Ke, WU Ke-ying, HE Shu-fang, and HUO Yu-jing
A unique 946 nm and 473 nm single-frequency non-planar ring cavity (NPRC) constituted of a thermally bonded Porro prism and a corner cube is proposed .By thermally bonding the YAG crystal with 2 mm thick Nd∶YAG crystal,the Porro prism supplies multi-functions such as laser amplification,closuring the light path,polarizA unique 946 nm and 473 nm single-frequency non-planar ring cavity (NPRC) constituted of a thermally bonded Porro prism and a corner cube is proposed .By thermally bonding the YAG crystal with 2 mm thick Nd∶YAG crystal,the Porro prism supplies multi-functions such as laser amplification,closuring the light path,polarization sensitivity to the 946 nm and so on.By applying the ring permanent magnet,the corner cube made of fuse silica is used to supply Faraday rotation effect.473 nm single-frequency and unidirectional blue laser by intracavity-frequency-doubling is achieved in the experiment..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, -1 (2009)
Influence of Thermophysical Parameters by Femtosecond Laser Ablation of Metals:Molecular Dynamics Simulation
WANG Xin-lin, WU He, CHANG Yan-xiao, ZHU Wei-hua, CHEN Zhi-yong, and LU Pei-xiang
The mechanisms of femtosecond (fs) laser ablating nickel (Ni) and aluminum (Al) are investigated by molecular dynamics simulations combined with two-temperature model.The central wavelength of 800 nm,pulse durations of 70 fs or 200 fs and energy fluence from 0.043 J·cm－2 to 0.40 J·cm－2 are considered in the sThe mechanisms of femtosecond (fs) laser ablating nickel (Ni) and aluminum (Al) are investigated by molecular dynamics simulations combined with two-temperature model.The central wavelength of 800 nm,pulse durations of 70 fs or 200 fs and energy fluence from 0.043 J·cm－2 to 0.40 J·cm－2 are considered in the simulation respectively.The evolutions of temperature,atomic configuration and pressure distribution in the target materials reveal the influences of thermophysical parameters and laser parameters on ablation process.The results show that the electronic thermo-conductivity still has great influence on laser-metals interaction under femtosecond time-scale.Comparing the results of fs laser ablating Ni and Al,the nonequilibrium between the electron and lattice temperature of Al continued for a longer time as the electron-lattice coupling constant of Al is much smaller than that of Ni.The balance time for surface and bottom electronic temperature of Al became shorter as the electronic thermal conductivity of Al is much larger than that of Ni.Nanocrystal structures appeare on the surface of Al film ablated with laser fluence of 0.4 J·cm－2..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3052 (2009)
All-fiber Watt-level Nanosecond Pulsed Yb-doped Fiber Amplifier
LIU Feng-nian, XU Ling-ling, FAN Wan-de, HUANG Bang-cai, JIANG Ming-shun, LIU Bo, KAI Gui-yun, and YUAN Shu-zhong
The fiber-based amplification of a commercially packaged,fiber pigtailed pulsed diode laser operating at wavelength of 1 064 nm (bandwidth of 0.45 nm) was reported.The cascaded Yb-doped fiber amplifier could operate safely by using cascaded fused wavelength division multiplexing (WDM) in each single-mode amplification The fiber-based amplification of a commercially packaged,fiber pigtailed pulsed diode laser operating at wavelength of 1 064 nm (bandwidth of 0.45 nm) was reported.The cascaded Yb-doped fiber amplifier could operate safely by using cascaded fused wavelength division multiplexing (WDM) in each single-mode amplification stage.The total isolation of cascaded WDM could protect the laser diodes from being destroyed by feedback of pump/signal power.At repetition rate of 50 kHz,pulse duration of 20 ns and average power of 0.5 mW,output power up to 0.6 W and peak power up to 600 W were obtained,with a high signal to noise ratio of 30 dB.The gain of the whole system is 30.8 dB and pulse distortion is not been observed..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3057 (2009)
Three-wavelength-range Whispering-gallery-mode Fiber Lasing Emission
ZHU Kun, JIANG Nan, HAN De-yu, ZHANG Yuan-xian, and PU Xiao-yun
A cylindrical micro-cavity is made by immersing a silica optical fiber into a low refractive index dye solution.Optically pumped by evanescent wave along the fiber axis,a long dye gain distance along the fibre axis is obtained,and lasing emission supported by Whispering-Gallery-mode in cylindrical micro-cavity is obserA cylindrical micro-cavity is made by immersing a silica optical fiber into a low refractive index dye solution.Optically pumped by evanescent wave along the fiber axis,a long dye gain distance along the fibre axis is obtained,and lasing emission supported by Whispering-Gallery-mode in cylindrical micro-cavity is observed.When a fibre diameter 288 μm is immersed into three glass capillaries filled separately with Rhodamine 6G,Rhodamine 610 and Rhodamine 640 dye ethylene glycol solution,Whispering Gallery Mode laser oscillation in the wavelength ranges of 567~575 nm、605~614 nm and 656~666 nm are observed,three-color lasing emission (red,orange and yellow) from a single optical fibre is realized.The obtained lasing spectra are mode assigned,the spatial intensity distributions of the assigned modes and pumping energy along the fiber′s cross section are calculated.The computational results show that dye gain is confined in the evanescent field of Whispering Gallery Mode of the fiber,which leads to a high pumping efficiency and a long gain distance along the fiber axis..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3061 (2009)
Experimental Research on Talbot Effect Under Ultrashort Pulses Laser Illumination
WANG Wei, and ZHOU Chang-he
Talbot effect of a grating under ultrashort pulses laser illumination is analyzed theoretically.In the experiment,ultrashort pulses laser is measured by a frequency-resolved optical gating (SHG-FROG) apparatus and the ultrashort pulses laser is expanded by a reflective expanded system.Experimental results are in good aTalbot effect of a grating under ultrashort pulses laser illumination is analyzed theoretically.In the experiment,ultrashort pulses laser is measured by a frequency-resolved optical gating (SHG-FROG) apparatus and the ultrashort pulses laser is expanded by a reflective expanded system.Experimental results are in good agreement with the theoretical analysis.Theoretically and experimentally investigations indicate that the contrast of Talbot images under ultrashort pulses laser illumination are remarkable decreased.In addition,the contrast of Talbot images are further decreased at longer Talbot distance and under shorter ultrashort pulses laser illumination..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3067 (2009)
Optimal Design of a Polymer Directional Coupler Electro-optic Switch Using Reversed Electrodes
ZHENG Chuan-tao, MA Chun-sheng, YAN Xin, WANG Xian-yin, and ZHANG Da-ming
To eliminate the negative effect of the fabrication error on the performance for the directional coupler electro-optic switch with single-section electrode,the structure is designed,the parameters are optimized,and the characteristics are analyzed for a polymer directional coupler electro-optic switch with two-section To eliminate the negative effect of the fabrication error on the performance for the directional coupler electro-optic switch with single-section electrode,the structure is designed,the parameters are optimized,and the characteristics are analyzed for a polymer directional coupler electro-optic switch with two-section reversed electrodes by using the coupled mode theory,electro-optic modulation theory,conformal transforming method and image method.Simulation shows that the designed device exhibits excellent switching functions.Under the operation wavelength of 1 550 nm,the coupling region length is 4 753.5 μm,the cross-state and bar-state voltages are about 1.22 V and 2.65 V,and the insertion loss and crosstalk are less than 2.21 dB and -30 dB,respectively.By slightly adjusting the state voltages,the blight of the fabrication errors on the switching characteristics can be easily eliminated.The calculation results of the presented technique are in good agreement with those of the beam propagation method (BPM)..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3072 (2009)
Optimization Design of compound Parabolic Concentrator in the Weak Light Detector
NIU Li-hong, LIAO Hua, ZHANG Jin-song, and WANG Xin
A Compound Parabolic Concentrator (CPC) is designed based on the principle of non-imaging optics to develop a novel Photomultiplier Tube (PMT).An efficient solution is proposed for the optimization design of CPC electron-optical parameters based on the Genetic Algorithm (GA).GA simulating the evolutionary mechanism of A Compound Parabolic Concentrator (CPC) is designed based on the principle of non-imaging optics to develop a novel Photomultiplier Tube (PMT).An efficient solution is proposed for the optimization design of CPC electron-optical parameters based on the Genetic Algorithm (GA).GA simulating the evolutionary mechanism of nature is a global optimization parallel searching method.The photoelectron collecting rate of anode is used as the fitness function of GA and the structure and electrical parameters as the optimization searching variables.By controlling the GA inheritance evolution direction,global optimization of CPC electron-optical system is realized.Simulation experimental results show that the optimized CPC is able to focus light and photoelectrons efficiently.As an example,for light incident angle of 30°,corresponding light transmission rate of above 75% and the photoelectron collecting rate of almost 100% are able to achieved respectively with the CPC.Such a design can be applied to develop the PMT of large detection area,and reflective photocathode for photon detection..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3079 (2009)
Polymer 2×2 Directional Coupler Electro-optic Switches
SUN Xiao-qiang, GAO Wei-nan, SUN Jie, GAO Lei, CHEN Chang-ming, ZHANG Da-ming, and LIU Shi-yong
The design and fabrication of a directional coupler electro-optic switches are presented.A strip-loading optical waveguide is proposed which uses organic/inorganic hybrid EO material,synthesized by sol/gel technique,as the active layer.Polymethyl-methacylate-glyciclyl-methacrylate(PMMA/GMA) with index regulator bis-A-eThe design and fabrication of a directional coupler electro-optic switches are presented.A strip-loading optical waveguide is proposed which uses organic/inorganic hybrid EO material,synthesized by sol/gel technique,as the active layer.Polymethyl-methacylate-glyciclyl-methacrylate(PMMA/GMA) with index regulator bis-A-epoxy,acting as the guiding waveguide,forms the coupler configuration.The device is fabricated by Corona poling,UV lithography and reactive ion etching method (RIE) process.A co-planar waveguide(CPW) electrode is adopted and the switches is working in electric push-pull way.The test results show that the device loss is about 16 dB,and a switching voltage of 9 V is observed..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3084 (2009)
Design of Tunable Optical Add-drop Multiplexer Based on Photonic Crystal Ring Resonators
QIANG Ze-xuan, QIU Yi-shen, JIANG Jun-zhen, CHEN Xi-yao, and BAI Ji-bo
A new tunable OADM based on photonic crystal ring resonators (PCRRs) is proposed by changing the silicon rod index of ring region.The provided PCRR also satisfies the well-known relationship between free spectral range (FSR) and ring radius R of traditional micro-strip ring resonators.The effect of index change on the A new tunable OADM based on photonic crystal ring resonators (PCRRs) is proposed by changing the silicon rod index of ring region.The provided PCRR also satisfies the well-known relationship between free spectral range (FSR) and ring radius R of traditional micro-strip ring resonators.The effect of index change on the dropped wavelength and its corresponding efficiency are then numerically analyzed by using two-dimensional finite-difference time-domain (FDTD) technique with perfectly matched layers (PML) as absorbing boundaries.1-nm dropped wavelength shift can be obtained with only 0.005-Δn and less than 1.4 μm effective ring radius..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3088 (2009)
A High-speed Multi-channel Optical Switch of Fiber Array
HOU Li-feng, REN Zhao-yu, TIAN Jin-shou, WEN Wen-long, WANG Jun-feng, LIU Hu-lin, XU Xiang-yan, CAO Xi-bin, SONG Feng-jun, YANG Jian-lun, and DANG Li-hong
The scintillator radiation imaging measurement system,which triggering and measuring time spectra are often controlled by optical switch,is used to measure the continuous time-varing process of diameter of the emission region in very short time.For collecting one-dimensional light intensity with large field of view in The scintillator radiation imaging measurement system,which triggering and measuring time spectra are often controlled by optical switch,is used to measure the continuous time-varing process of diameter of the emission region in very short time.For collecting one-dimensional light intensity with large field of view in short time,the transcoding technology and GRIN lens rectangular array are introduced in this optical switch,and measuring the large field of view by using small-caliber electro-optic crystal is achieved.As high-voltage synchronous circuit based on Series of MOSFETs is introduced,the systems have some merits,such as compact structure,high function-price ratio,long life and so on.The results reveal that the gating time is 100±5 ns,rising edge time and falling edge time is within 25 ns and extinction ratio is 1 100∶1..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3092 (2009)
Super Cell Calculation of GaN/AlN Semiconductor Heterojunction Valence-band Offsets
SONG Jia-ming, CHEN Guang-de, YE Hong-gang, ZHU You-zhang, and WU Ye-long
In order to understand the electronic structure of GaN/AlN heterojunction deeply,it is calculated by the density functional theory based on the first principle plane wave pseudopotential method,via the super cell model.The direct calculation of the GaN/AlN super cell demonstrates that the GaN/AlN heterojunction is homoIn order to understand the electronic structure of GaN/AlN heterojunction deeply,it is calculated by the density functional theory based on the first principle plane wave pseudopotential method,via the super cell model.The direct calculation of the GaN/AlN super cell demonstrates that the GaN/AlN heterojunction is homotype and changes abruptly at the interface,besides,the valence-band offsets of GaN/AlN is 0.62 eV,which is very close to the experimental result.Additionally,it can be concluded that the super cell calculation has more advantages than the other common indirect calculation of heterojunction band offsets,such as the average bond energy,the average potential and the core state.The super cell calculation supplies more information of the GaN/AlN heterojunction interface while the reference energy band methods can not.Nevertheless,band-offsets parameters obtained by the other indirect methods are also reasonable compared with the experimental value..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3097 (2009)
Spectrum Blue-Shift in Organic Multilayer Well Structure
HUANG Jin-zhao, LI Shi-shuai, FENG Xiu-peng, and YU Feng
To investigate the reason of spectrum blue-shift in organic multilayer well structure,the organic multilayer well structures,in which the N,N′-Di-［(1-naphthalenyl)-N,N′-diphenyl］-(1,1′-biphenyl)-4,4′-diamine (NPB) and Tris-(8-quinolinolato)aluminum(Alq3) are used as barrier layer and well layer respectively,are fabricaTo investigate the reason of spectrum blue-shift in organic multilayer well structure,the organic multilayer well structures,in which the N,N′-Di-［(1-naphthalenyl)-N,N′-diphenyl］-(1,1′-biphenyl)-4,4′-diamine (NPB) and Tris-(8-quinolinolato)aluminum(Alq3) are used as barrier layer and well layer respectively,are fabricated.By changing the number of period and the thickness of well layer,the properties of photoluminescence in organic multilayer well structure are investigated.The blue-shift with the decreasing of well thickness is caused by the overlap of spectrum in the well structure,but not the quantum size effect and exciton confinement effect..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3100 (2009)
Logarithm Compression Scheme for Detecting the Transient Feeble Optical Signal from Space
LIANG Yi-tao, TANG Yao, WEN De-sheng, WANG Hong, and SHI Xing-chun
Based on the properties of transient feeble optical signal,which is the wide dynamic range and the feeble lower limit signal,a novel detecting scheme compressing signal in logarithmic field is presented.After the principle analysis of the scheme,it is implemented to choose appreciate parts,design the circuitry and testBased on the properties of transient feeble optical signal,which is the wide dynamic range and the feeble lower limit signal,a novel detecting scheme compressing signal in logarithmic field is presented.After the principle analysis of the scheme,it is implemented to choose appreciate parts,design the circuitry and test.The results indicat that the approach can make transient optical signal ranged 120 dB compress in the range of 0~5 V.And together with the circuitry design simplifies and the dissipation decreases,the troubles at the back data acquisition module can be lessened greatly..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3104 (2009)
Theoretical Study of Geometrical Structures and Properties of PtnNim(n+m=6,n、m≠0)clusters
ZHANG Xiu-rong, GAO Cong-hua, and HONG Ling-li
All the possible geometrical structures of PtnNim(n+m=6,n、m≠0)clusters are optimized with a hybrid Density functional theory (B3LYP) at Lanl2dz level.For the ground state structures,the energy，thermodynamic properties，Nucleus Independent Chemical Shifts (NICS)，spectrum and polarizability are studied.The calculated resuAll the possible geometrical structures of PtnNim(n+m=6,n、m≠0)clusters are optimized with a hybrid Density functional theory (B3LYP) at Lanl2dz level.For the ground state structures,the energy，thermodynamic properties，Nucleus Independent Chemical Shifts (NICS)，spectrum and polarizability are studied.The calculated results show that:the ground state structures of PtNi5,Pt2Ni4 and Pt3Ni3 clusters are quadrangular bi-pyramid,and Pt4Ni2 and Pt5Ni clusters are triangular bi-pyramid with hat and triangular pyramid with quadrilateral,respectively.From the point of view of thermodynamics,PtnNim clusters are stable because of the negative enthalpy of formation; the positive NICS of PtNi5 clusters show anti-aromaticity,the negative NICS of Pt2Ni4 and Pt5Ni clusters show aromaticity.The number of the IR absorption peak of Pt3Ni3 is the most.The IR and Raman absorption peak of PtNi5 ,IR of Pt2Ni4,Raman of Pt3Ni3 and Pt4Ni2 have only one.The absorption peak of Pt5Ni appears in the bigger frequencies only,and is zero almost in the small frequencies..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3109 (2009)
Simulating Calculation of Lightning Detection Efficiency and False Alarm Rate for Lightning Imagery on Geo-satellite
HUANG Fu-xiang, GUO Jun-bai, and FENG Xiao-hu
Based on the clear define of lightning dectection efficiency and false alarm rate,and quantitative models is built to illuminate the influence of signal-to-noise ratio on LDE and FAR. Simulating calculation results show that to control FAR below 10%,the signal-to-noise ratio should be as big as 5.0 at least;and to keepBased on the clear define of lightning dectection efficiency and false alarm rate,and quantitative models is built to illuminate the influence of signal-to-noise ratio on LDE and FAR. Simulating calculation results show that to control FAR below 10%,the signal-to-noise ratio should be as big as 5.0 at least;and to keep LDE 90%,the signal-to-noise ratio should be between 5.2 to 5.7..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3116 (2009)
Preparation and Characterization of ZnO-SnO2 Transparent and Conducting Thin Film
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Transparent and conducting polycrystalline oxide thin films of ZnO-SnO2 are prepared on glass subsrate by the process of gelatination in two-step.The crystalline structure of the thin film, surface morphology, optical transmittance and conductivity are characterized by X-ray diffraction(XRD), Atomic force microscope(AFTransparent and conducting polycrystalline oxide thin films of ZnO-SnO2 are prepared on glass subsrate by the process of gelatination in two-step.The crystalline structure of the thin film, surface morphology, optical transmittance and conductivity are characterized by X-ray diffraction(XRD), Atomic force microscope(AFM), Spectrophotometeric analysis(UV-Vis),device of film analysis and Four-point probes, respectively.The results indicate that the transparent conducting thin film with Zn/Sn=9/12 has the optimal performance at the annealing tempareture of 500 ℃ and the ultraviolet-visible light transmittance reached 90% with 3.15×10-3 Ω·cm resistance.Compared with other methods,transparent and conducting thin films of ZnO-SnO2 prepared by gelatination in two-step has excellent characteristics..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3121 (2009)
Testing of KDP Crystal Refractive Index Nonuniformity
CHAI Li-qun, SI Qi-kai, XU Jian-cheng, DENG Yan, and XU Qiao
Based on a method named Orthogonal Polarization Interferometry,testing system on refractive index nonuniformity of KDP crystal is proposed,and phase detuning angle can also be indirectly tested.Polarizaton state of the testing light is precisely controlled and switched in the interferometer.Error introduced by tilt of Based on a method named Orthogonal Polarization Interferometry,testing system on refractive index nonuniformity of KDP crystal is proposed,and phase detuning angle can also be indirectly tested.Polarizaton state of the testing light is precisely controlled and switched in the interferometer.Error introduced by tilt of the optical element is avoided by adopting wavelength-tuning phase shifting method.Phase shifting algorithm is optimized to raise testing precision and repeatbility.Analytic algorithm of index of refraction nonuniformity is designed,and therefore the error introduced by variation in the crystal thickness is avoided.The measurement result for the crystal with small aperture shows that the accuracy of the instrument is better than 10-6 (RMS)..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3126 (2009)
Experimental Study on Femtosecond Opticl Kerr Effect in liquid CS〈sub〉2〈/sub〉
YANG Qing, LIN Tian-xing, SI Jin-hai, CHEN Feng, and HOU Xun
The ultrafast nonlinear optical properties in liquid CS2 are investigated by the femtosecond optical Kerr shutter technique at wavelength of 800 nm.Measurements for the dependence of Kerr signals on the polarization angle between the pump and probe beams show that the Kerr signals induced by 30 fs pulse laser arise maiThe ultrafast nonlinear optical properties in liquid CS2 are investigated by the femtosecond optical Kerr shutter technique at wavelength of 800 nm.Measurements for the dependence of Kerr signals on the polarization angle between the pump and probe beams show that the Kerr signals induced by 30 fs pulse laser arise mainly from the photoinduced birefringence effect ,but not from a laser-induced transient grating as absorbed when using a 200 fs pulse laser.The OKE signal intensity increases with the increases of the intensity of pump beam..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3130 (2009)
Impact of Ultra-short Pulse Propagation with Third-order Nonlinear Dispersion in Negative Refractive Media
ZHANG Hai-xia, and YANG Xing-yu
The split-step Fourier method is used to simulate the impact of ultra-short pulse with third-order nonlinear dispersion.In the frequency of Drude model of selecting certain range,the impact of third-order nonlinear dispersion to ultra-short pulse can not be ignored by numerical calculating.When third-order nonlinear diThe split-step Fourier method is used to simulate the impact of ultra-short pulse with third-order nonlinear dispersion.In the frequency of Drude model of selecting certain range,the impact of third-order nonlinear dispersion to ultra-short pulse can not be ignored by numerical calculating.When third-order nonlinear dispersion is negative,the results show that in the normal dispersion,ultra-short pulse is wide asymmetric and pulse central drifts to the forefront; in zero dispersion,the degree of asymmetry broadening of ultra-short pulse increass and the center of pulse which drifts to the forefront had a oscillation only in the forefront of pulse.In anomalous dispersion,ultra-short pulse is asymmetry narrow,the central of pulse also drifted to the forefront..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3133 (2009)
Numerical Methods and Application for Optical Maxwell-Bloch Equations
LI Cheng, ZHANG Hua-Rong, and YU Xiang-Yang
An accurate and effective numerical method is presented to solve the Maxwell-Bloch equations,which describe the optical pulse propagation and interaction with homogeneously broadened two-level medium.The convergence and stability of this numerical method are also proved by comparing with the analytic solutions derived An accurate and effective numerical method is presented to solve the Maxwell-Bloch equations,which describe the optical pulse propagation and interaction with homogeneously broadened two-level medium.The convergence and stability of this numerical method are also proved by comparing with the analytic solutions derived under special condition,and the method maintains its erroneous exponents and is applicable.Simulations of arbitrary conditions are discussed by employing this new method,and the evolutions of pulse and Bloch vectors for different detunings,relaxation times and initial input pulse power are analyzed.The established numerical method can be used to solve the Maxwell-Bloch equations and their corrections..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3138 (2009)
Waveguides Induced by Closed-circuit Gray Photovoltaic Solitons
CHEN Dan, ZHANG Mei-zhi, YANG Yan-long, and LU Ke-qing
The theory of waveguides induced by gray solitons in closed-circuit photovoltaic crystals is analyzed. The study shows that waveguides induced by gray closed-circuit photovoltaic solitons are only a single guided mode for all soliton graynesses and all values of both the electric current density and the ratio between tThe theory of waveguides induced by gray solitons in closed-circuit photovoltaic crystals is analyzed. The study shows that waveguides induced by gray closed-circuit photovoltaic solitons are only a single guided mode for all soliton graynesses and all values of both the electric current density and the ratio between the soliton peak intensity and the dark irradiance. The results explain that the confined energy near the center of a gray closed-circuit photovoltaic soliton increases with the electric current density and decreases with an increase in both the soliton grayness and ratio between the soliton peak intensity and dark irradiance. Relevant examples are provided where the photovoltaic crystal is assumed to be LiNbO3..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3145 (2009)
Optimal Design of LC Adaptive Optics System for Human Retinal Imaging
CHENG Shao-yuan, CAO Zhao-liang, HU Li-fa, MU Quan-quan, JIANG Bao-guang, LI Peng-fei, and XUAN Li
Aiming at some weakness of the old LC adaptive optics system for human retinal imaging,a new design scheme is presented.The new system can obtain high-spacial-resolution retinal image for eye under different diopters.The pupil-monitoring system,imaging-orientation system are adopted to avoid stray light,which can make Aiming at some weakness of the old LC adaptive optics system for human retinal imaging,a new design scheme is presented.The new system can obtain high-spacial-resolution retinal image for eye under different diopters.The pupil-monitoring system,imaging-orientation system are adopted to avoid stray light,which can make sure the precision of orientation and detection.The research results show that the new system is more convenient,more flexible and suitable for widely application and extension..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3150 (2009)
Calculation of Coherent Combination Based on Self-imaging Confocal resonator
JIN Ruo-nan, XU Zi-chao, SONG Xing-liang, ZHOU Yi, LIU L P, and CHEN Y C
The mode of coherent combination of laser arrays is set up based on self-imaging confocal resonator.One-dimensional coherent combination and two-dimensional coherent combination are calculated and the intensity distribution of the field is obtained.Spatial filter used for mode selection is studied.Besides,the effect ofThe mode of coherent combination of laser arrays is set up based on self-imaging confocal resonator.One-dimensional coherent combination and two-dimensional coherent combination are calculated and the intensity distribution of the field is obtained.Spatial filter used for mode selection is studied.Besides,the effect of the place and the width of the special filter on the coherent combination is analyzed,which gives the basis to the experiment..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3154 (2009)
Optical System Design of an Airborne Multispectral Camera
SUN Xin, BAI Jia-guang, WANG Zhong-hou, BAI Qing-lan, and HUANG Min
The scheme of dual-camera combination is given to obtain high spatial resolution and wide pushbroom scanning width for airborne multispectral camera.The parameters of the optical subsystem are determined by system detecting capability estimation and user′s requirement.Subsequently,the subsystem design is pressented basThe scheme of dual-camera combination is given to obtain high spatial resolution and wide pushbroom scanning width for airborne multispectral camera.The parameters of the optical subsystem are determined by system detecting capability estimation and user′s requirement.Subsequently,the subsystem design is pressented based on ray-tracing technique.The subsystem adopts the double-gauss configuration,which has an effective focal length of 175 mm,a field of view of 18°,an F-number of F/3.6 and the spectral range of 500~900 nm..The result is highly optimized to meet the requirement of combination.The moderate tolerance calculation results show that the system is easy to be fabricated and assembled..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3160 (2009)
A Novel Spectral Similarity Measurement Kernel Based Anomaly Detection Method in Hyperspectral Imagery
MEI Feng, ZHAO Chun-hui, SUN Yan, and WANG Li-guo
A novel spectral similarity measurement kernel function is proposed and applied to anomaly detection in hyperspectral imagery.As the Gaussian Radial Basis Function (RBF) is based on the Euclidean distance of two spectral vectors,it is sensitive for distance variations of two spectral vectors,but not for spectral curve A novel spectral similarity measurement kernel function is proposed and applied to anomaly detection in hyperspectral imagery.As the Gaussian Radial Basis Function (RBF) is based on the Euclidean distance of two spectral vectors,it is sensitive for distance variations of two spectral vectors,but not for spectral curve variation coming from radiation intensity variation,shadow,and shading etc.When the spectral curves of a material are variety,the detection performance of the RBF based anomaly detectors degenerate.In order to solve the spectral curves variation problems for the same materials,a spectral similarity measurement kernel function is proposed according to the spectral curves similarity description.A theoretical analysis is expounded and numerical experiments are conducted on real hyperspectral imagery.The detection result comparison of Gaussian Radial Basis Function based and Spectral Similarity Measurement Kernel based anomaly detector shows the Spectral Similarity Measurement kernel can improve the performance of kernel base anomaly detection methods in hyperspectral imagery..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3165 (2009)
Recognition of Mature Citrus in Natural Scene Using Spectral Imaging and Spectral Angle Mapper
CAI Jian-rong, WANG Jian-hei, CHEN Quan-sheng, WANG Feng, and LV Qiang
In order to guide the robots to harvest citrus fruit in complex natural scenes,a method based on image processing is developed to identify citrus fruit in the tree canopy.Due to the complexity of natural environment and the deficiency of identification of citrus fruit by the traditional methods,five narrow band filtersIn order to guide the robots to harvest citrus fruit in complex natural scenes,a method based on image processing is developed to identify citrus fruit in the tree canopy.Due to the complexity of natural environment and the deficiency of identification of citrus fruit by the traditional methods,five narrow band filters in the visible and near-infrared region are selected to capture five images.Spectral angle mapper (SAM) algorithm is attempted to process these images.Experiment results show that citrus can be recognized with an accuracy of 96% in different aspect of illumination angle and intensity.This work demonstrates that spectral imaging technique based on filters combining with SAM algorithm can be used effectively to identify citrus fruit in complex natural scenes..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3171 (2009)
Investigation on Structure Properties of Slow Light in Photonic Crystal Coupled Resonator Optical Waveguide
LI Chang-hong, TIAN Hui-ping, LU Hui, and JI Yue-feng
The significant effect factor of slow light transmission in photonic crystal coupled resonator optical waveguide is investigated.The change tendency of guided mode band,group velocity and group delay with the tuning of distance between neighboring cavities are discussed.The guided mode is flattened clearly and the grouThe significant effect factor of slow light transmission in photonic crystal coupled resonator optical waveguide is investigated.The change tendency of guided mode band,group velocity and group delay with the tuning of distance between neighboring cavities are discussed.The guided mode is flattened clearly and the group velocity decreases sharply with the increasing of cavities distance.When the interval between contiguous cavities is 7 lattice constants of photonic crystal,the ultra small group velocity below 2×10-4c is obtained.This is roughly two orders of magnitude smaller than that in line defect PC waveguide.The maximal group delay through CROW of 13.23 μm with supercell 7×7 exceeds 400 ps,which are four orders of magnitude larger than that in traditional waveguide with the same length..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3214 (2009)
Amplification and Propagation of Ultrashort Pulse in High Power Photonic Crystal Fiber Amplifier
ZHANG Yu-ling, YANG De-xing, HUANG Guo-ling, and ZHAO Jian-lin
The dependences of the signal pulse average power and gain coefficient on the distance are obtained by using the rate equations and power propagation equations,and the Ginzburg-landau equation is employed to study the propagation of the ultrashort pulse.The results show that parameters suchlike signal pulse average powThe dependences of the signal pulse average power and gain coefficient on the distance are obtained by using the rate equations and power propagation equations,and the Ginzburg-landau equation is employed to study the propagation of the ultrashort pulse.The results show that parameters suchlike signal pulse average power,energy and gain coefficient are not susceptible to the dispersion and nonlinear effect,while signal pulse peak power,and the characteristics of time and frequency domain are easy to be affected by the dispersion and nonlinear effect.The instability of pulse width caused by pulse splitting and broadening and the effect of the instability on pulse propagation are analyzed and discussed under the consideration of the nonlinear effect.It reveals that the accuracy of numerical simulation can be improved by introducing the pulse width instability in the study of the pulse propagation..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3220 (2009)
Random Vibration Analysis of Tip/Tilt Mirror in a Space Telescope Correlation Tracking System
WANG Hong-wei, RUAN Ping, XU Guang-zhou, and YANG Jian-feng
The analysis method of structural random vibration response by the base excitation is described.The finite element model of tip/tilt mirror is established and its vibration analysis is performed by the finite element software ANSYS.So that the performance of tip/tilt mirror against the dynamic environment is studied.ThThe analysis method of structural random vibration response by the base excitation is described.The finite element model of tip/tilt mirror is established and its vibration analysis is performed by the finite element software ANSYS.So that the performance of tip/tilt mirror against the dynamic environment is studied.The results have been analyzed.By analyzing the weakness of the present structure,an anti-vibration suggestion is put forward,which is useful to improve the structure,and reform for the further development of tip/tilt mirror..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3226 (2009)
TLE Conversion of the Non-cooperative Space Object Using Bearing-only Measurements
ZHANG Tao, CHEN Rong-li, ZHANG Ying-sheng, and CHENG Hong-wei
In order to solve the TLE conversion problem in space-based optical surveillance,the UT and mixed-state space are introduced,and the SGP4 propagator is embedded in the tracking filtering.This new TLE conversion method is called mixed-state SPKF.Simulation results indicate that the new method can utilize the bearing-onlIn order to solve the TLE conversion problem in space-based optical surveillance,the UT and mixed-state space are introduced,and the SGP4 propagator is embedded in the tracking filtering.This new TLE conversion method is called mixed-state SPKF.Simulation results indicate that the new method can utilize the bearing-only measurements to realize the TLE conversion of the space object,especially of the non-cooperative objects..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3230 (2009)
Design of a Lagre Area Array CMOS APS Camera System
LIU Xin-ming1, LIU Wen, and LIU Zhao-hui
A camera system is designed based on the large area array CMOS APS image sensor LUPA-4000.Through analyzing the timing of LUPA-4000,the incorporate program comprised CMOS image sensor driving,communication and data format conversion is described with VHDL.Each program module is specified.FPGA (field programmable gate aA camera system is designed based on the large area array CMOS APS image sensor LUPA-4000.Through analyzing the timing of LUPA-4000,the incorporate program comprised CMOS image sensor driving,communication and data format conversion is described with VHDL.Each program module is specified.FPGA (field programmable gate array) is chosen as the driving signals′ hardware carrier.The circuit system is designed.Driving signals of CMOS image sensor is tested after program loading.Pixel integration control signals′ waveforms are given.The whole system runs steadily and reliably.Its communication with computer is exact and its data transfer with lower computer is accurate.Image with high quality is taken after installing optical system..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3235 (2009)
Influences of the Alignment Errors on Image Quality of Large Segmented Mirrors
CHEN Rong-li, ZHANG Tao, MA Zhen, and FAN Xue-wu
Influences the alignment errors on the image quality of the large segmented mirror are theoretically analyzed and numerically simulated formed by seven hexagonal segments in the thesis.By employing the properties of the Fourier-transform,an analytic Fourier-transform method is presented that can be used to deduce the pInfluences the alignment errors on the image quality of the large segmented mirror are theoretically analyzed and numerically simulated formed by seven hexagonal segments in the thesis.By employing the properties of the Fourier-transform,an analytic Fourier-transform method is presented that can be used to deduce the point-spread-functions of the segmented mirror with alignment errors.Based on the Fast-Fourier-transform technique,the point-spread-functions in the presence of edge misconfigure,transverse excursion,and tilt errors on an individual segment are simulated.And the image qualities are numerically simulated according to the imaging principle.It is revealed that the edge misconfigure errors almost have no influence on the image qualities,but the influences due to the transverse excursion errors are relatively intensive in comparison with that due to the tilt errors..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3240 (2009)
Primary Characteristics Measurement of MEMS Deformable Mirrors
CHEN Jia-feng, and CHEN Hai-qing
The fundamental structure and channel assignments for actuator mirror of deformable mirrors based on microelectromechanical system(MEMS) technique are introduced.The deformation principle of MEMS deformable mirrors(MEMS-DMs) is analyzed.The relation between the deformation of the mirror surface and the voltages appliedThe fundamental structure and channel assignments for actuator mirror of deformable mirrors based on microelectromechanical system(MEMS) technique are introduced.The deformation principle of MEMS deformable mirrors(MEMS-DMs) is analyzed.The relation between the deformation of the mirror surface and the voltages applied to the mirror electrodes is deduced.The composition and testing principle of the computer-controlled stroboscopic microscopic interferometer system are analyzed.The static voltage versus displacement curve,surface shape map and out-of-plane-deflections and resonant frequency of MEMS-DMs are measured.The experiment shows that the test results agree well with the theory analysis..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3245 (2009)
>Changes of Biophoton Emission of Plant Leaf Induced by H2O2 and Its Significance
XI Gang, LU Hong, and LI Shao-hua
In order to study the relationship between biophoton emission of plant leaf and oxidative stress,the leaf of plant(Schefflera)is treated with different concentration H2O2 solution.The experimental result indicates that along with the time of leaf treated with the concentration 7.5%,15% and 30% H2O2 extension,spontaneouIn order to study the relationship between biophoton emission of plant leaf and oxidative stress,the leaf of plant(Schefflera)is treated with different concentration H2O2 solution.The experimental result indicates that along with the time of leaf treated with the concentration 7.5%,15% and 30% H2O2 extension,spontaneous biophoton emission(BPE) of biophoton emission in leaf increased obviously compared with the control that the leaf had not treated with H2O2 solution,and the dynamics curves of delayed luminescence(DL) in leaf showed hyperbolic relaxation.Through the establishment of non-linear dynamics equation about DL and the mathematical simulation,the initial photon number I0,coherence time τ and weaken parameter β about DL are obtained.The analysis results discover that along with the time of leaf treated with H2O2 extension,initial photon number I0 of various treatment groups droped first,latter rose,then dropped again,but the values of coherence time τ and weaken parameter β of two treatment groups about 7.5% and 15% H2O2 stress presented fluctuation change,the values of τ and β of treatment group about 30% H2O2 stress presented the monotonous drop tendency.We extrapolated that the change of BPE had reflected the change of active oxygen content in cell under H2O2 stress,the change of initial photon number I0 of DL had reflected overall metabolism′s change in cell,the changes of τ and β about DL had reflected the adaptation and damage process about cell to H2O2 stress..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3250 (2009)
Signal Processing Algorithm on Up-converting Phosphor Technology-based Biosensor
XIE Cheng-ke, ZHANG You-bao1, HUANG Li-hua, QU Jian-feng, GUO Xiao-xian, and HUANG Hui-jie
In order to improve the operating simplicity of the Up-converting Phosphor Technology-based biosensor(UPT-based biosensor),a novel signal processing algorithm is improved.The UPT-based biosensor is an optical biosensor,where a kind of up-converting phosphor(UCP) particle serves as the biological marker.The original sigIn order to improve the operating simplicity of the Up-converting Phosphor Technology-based biosensor(UPT-based biosensor),a novel signal processing algorithm is improved.The UPT-based biosensor is an optical biosensor,where a kind of up-converting phosphor(UCP) particle serves as the biological marker.The original signal is preprocessed by cross-correlation technique to get a copy of backup-data.These backup-data are used to fix on the borderlines of the function lines(the test line T and the control line C) of the UPT immune chromatographic test strip.And,the borderlines of the function lines are determined automatically with the adaptive borderline orientation algorithm.The areas of the graphics consisted of the borderlines,the signal curve and the position axis for each function line are calculated,and the test line signal ST and the control line signal SC are obtained.The ratio R of ST to SC,which is proportional to the concentration of the target analyte,is used as the judgment information.A group of standard samples are tested depend on the above algorithm in a series of experiments.It is proved to have high sensitivity(~ng/mL) and high stability(CV<5%),which can meet the need of biomedical detection..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3256 (2009)
Scheme for Wide-area Quantum Secure Direct Communication Network Based on Decoy States
QUAN Dong-xiao, PEI Chang-xing, LIU Dan, and ZHAO Nan
A scheme for wide-area Quantum Secure Direct Communication (QSDC) Network based on decoy states is proposed.A server which is used to prepare and measure photons,is set in each local area network,so the communication distance increases.In addition,the idea of decoy states,which is to send photon pulses of different intA scheme for wide-area Quantum Secure Direct Communication (QSDC) Network based on decoy states is proposed.A server which is used to prepare and measure photons,is set in each local area network,so the communication distance increases.In addition,the idea of decoy states,which is to send photon pulses of different intensities to detect Photon Number Splitting (PNS) attack,is introduced to QSDC to improve the security of the communication.And,the transmission probability is estimated based on the channel parameter,which can be used as a reference for channel coding.Security analysis result shows that this protocol can be used to realize long distance QSDC..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3283 (2009)
Teleportation of an Unknown Atomic-entangled State via the Interaction of V-type Three-level-atom with Two-mode Cavity Field
LU Dao-Ming, and CHEN Li-hua
Time evolution of state vector of the system of V-type three-level-atom interacting with two-mode cavity field is obtained.An alternative scheme is proposed for teleportation of an unknown atomic-entangled state without the Bell-state measurement.The scheme is based on the resonant interaction of V-type three-level-atoTime evolution of state vector of the system of V-type three-level-atom interacting with two-mode cavity field is obtained.An alternative scheme is proposed for teleportation of an unknown atomic-entangled state without the Bell-state measurement.The scheme is based on the resonant interaction of V-type three-level-atom with two-mode cavity field.By means of selective measurement on the atom to be teleported state,it follows that the teleportation of an unknown atomic-entangled state is realized.And the scheme is experimentally feasible based on the current cavity QED technique and the success probability is 1/16..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3288 (2009)
A Fast Optoelectronic Tracking Method Based on Multirate IMM Algorithm
WANG Da-bao, LIU Shang-qian, and MA Cai-wen
Aiming at disadvantages of heavy computational of interacting multiple model particle filter(IMMPF) algorithm,an interactive multiple model tracking algorithm based on multirate tracking method(MRT) is proposed.The mixed filter between pattern space and measurement space is achieved,and the data is updated at a differeAiming at disadvantages of heavy computational of interacting multiple model particle filter(IMMPF) algorithm,an interactive multiple model tracking algorithm based on multirate tracking method(MRT) is proposed.The mixed filter between pattern space and measurement space is achieved,and the data is updated at a different rate according to the manoeuvrability of each model.And,each model marches different filter: the poor-maneuver model matches Kalman filter and the strong-maneuver model matches the particle filter.The simulation results show that the computational costs of this algorithm is reduced significantly by a factor of 38.9% compared with that of traditional IMMPF algorithm,with comparable tracking performance to IMMPF.It can improve the real-time performance and reliability of optoelectronic target tracking system effectively..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3291 (2009)
Image Recognition and Tracking System for High Frame Frequency Object Based on Kalman Predictor and Fuzzy PID Technology
HUANG Hai-bo, AI Yong, CHEN Jing, ZHANG Yong-qin, ZUO Tao, and YE De-mao
In order to track with the beacon facular real time and high precisely for fine tracking system in space light communication,a suit of fine tracking control flat based on high frame frequency CMOS camera is designed,and image processing and control algorithms are all integrated into the large scale FPGA chip.Fuzzy reasIn order to track with the beacon facular real time and high precisely for fine tracking system in space light communication,a suit of fine tracking control flat based on high frame frequency CMOS camera is designed,and image processing and control algorithms are all integrated into the large scale FPGA chip.Fuzzy reasoning rules are combined with general PID algorithm,which improve the control precision of nonlinear system.Kalman predictor is combined with fuzzy PID algorithm,which realizes real-time and forward control for FSM.Field experiment result shows that the system is capable of restraining outside disturbance,realizing exact tracking facular weak object,and it has the characteristics of high-speed response,high-precision stability and powerful ability of anti-jamming..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3295 (2009)
Remote Sensing Image De-noising Algorithm Based on Integer Recurrent Generalized Cross Validation
ZHANG Li-bao, ZHU Tong, and YU Xian-chuan
A computationally efficient IR-GCV (integer recurrent generalized cross validation) algorithm is proposed.The integer grey-scale pixels are transformed into integer wavelet coefficient,and its distribution is calculated,followed by the incorporative numeration of coefficient of the same value.Furthermore the integer reA computationally efficient IR-GCV (integer recurrent generalized cross validation) algorithm is proposed.The integer grey-scale pixels are transformed into integer wavelet coefficient,and its distribution is calculated,followed by the incorporative numeration of coefficient of the same value.Furthermore the integer recurrent procedure based on integer wavelet coefficient is applied,which take full advantage of the relevance between GCV functions under adjacent thresholds.The comparison among GCV and IR-GCV is carried out on multiple remote sensing images.When the noise standard deviation varies from 10 to 30,the time complexity of IR-GCV is only 2 percent to 0.5 percent of that of GCV,while the de-noising results still remain unchanged.The PSNR of de-noising image is 0.66 db to 6.03 db higher than that of noisy image.Besides,the time complexity of GCV increases rapidly as the noise standard deviation and scale of remote sensing image increase,while the time complexity of IR-GCV is relatively more stable..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3301 (2009)
Interferogram Compression Based on Wavelet Transform
HU Huang-hua, YUAN Yan, ZHOU Yu, and ZHANG Xiu-bao
Based on the research of wavelet transform and SPIHT(Set Partitioning in Hierarchical Trees algorithm,wavelet image compression technology is introduced to compress interferogram.In addition,in the wavelet decomposition coefficient matrix,high-frequency image data are close to zero,the information is mainly manifested Based on the research of wavelet transform and SPIHT(Set Partitioning in Hierarchical Trees algorithm,wavelet image compression technology is introduced to compress interferogram.In addition,in the wavelet decomposition coefficient matrix,high-frequency image data are close to zero,the information is mainly manifested in the part of the low-frequency image,and the mainly information storage is close to zero optical path difference in the interferogram.A row of interferogram data is disconneted and the data are stored with Z-storage array to the matrix form,which is compressed with wavelet algorithm.The research results show that the improvement can raise compression performance..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3307 (2009)
A New Algorithm of Cloud Removing for Optical Images Based on Wavelet Threshold Theory
ZHU Xi-fang, WU Feng, and TAO Chun-kan
Frequency relationships of wavelet coefficients describing sceneries and cloud in a single optical remote sensing image are analyzed after it is decomposed by wavelet transform.An algorithm of cloud threshold is proposed for removing cloud.Scenery information and cloud noises are distributed to coefficients of low leveFrequency relationships of wavelet coefficients describing sceneries and cloud in a single optical remote sensing image are analyzed after it is decomposed by wavelet transform.An algorithm of cloud threshold is proposed for removing cloud.Scenery information and cloud noises are distributed to coefficients of low levels and high levels respectively by choosing appropriate numbers of demarcation levels.Most of cloud noises and some scenery information are included in high level coefficients where cloud is brighter than scenery.Cloud can be removed from these coefficients and scenery information can be kept by setting a threshold with brightness.Weight factors are assigned to detail coefficients of low level,high level,and approximation coefficients respectively for enhancing the contrast of sceneries and decrease remaining cloud.The three parts of coefficients are reconstructed and fused to get processed result.Entropy is proposed to be a criterion to choose best demarcation level,weighted factor and threshold.It is proved that according to the entropy as a criterion these parameters can be chosen correctly by experiments.And the proposed algorithm is better than homomorphism filtering and Retinex algorithm..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3312 (2009)
An Algorithm for Moving Point Target Background Suppression Based on NSCT
QIN Han-lin, ZHOU Hui-xin, LIU Shang-qian, and YANG Ting-wu
A new infrared ground point background suppression algorithm based on the Nonsubsampled Contourlet Transform (NSCT) is presented.Raw image is decomposed using NSCT,different operators are adapted in different decomposition scales and directions,and background suppression image is obtained by NSCT reconstruction.When coA new infrared ground point background suppression algorithm based on the Nonsubsampled Contourlet Transform (NSCT) is presented.Raw image is decomposed using NSCT,different operators are adapted in different decomposition scales and directions,and background suppression image is obtained by NSCT reconstruction.When compared with conventional mathematical morphology Top-hat algorithm,several groups of experimental results demonstrate that the presented algorithm can suppress background effectively and the signal-noise ratio and contrast of image is improved efficiently..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3318 (2009)
A Sub-pixel Registration Approach Based on Powell Algorithm
DING Hai-yong, and BIAN Zheng-fu
A novel motion parameters estimation approach for sub-pixel accuracy is presented which is based on Powell optimization and the pyramid decomposition method of the images. The non-linear least square formula for the difference of reference and sensed images is seen as the object function for Powell algorithm in which mA novel motion parameters estimation approach for sub-pixel accuracy is presented which is based on Powell optimization and the pyramid decomposition method of the images. The non-linear least square formula for the difference of reference and sensed images is seen as the object function for Powell algorithm in which motion parameters are used as variations. Based on multi-resolution decomposition from fine to coarse representation of images, sub-pixel parameters can be accurately estimated. Numerical experiment results indicate that the proposed algorithm can be used to perform accuracy and robust sub-pixel parameters estimation. The drawback of this algorithm is the longer waiting time compared with that of other algorithms..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3322 (2009)
Infrared-Visual Images Automatic Registration Based on Corners
WANG A-ni, MA Cai-wen, LIU Shuang, LIU Cong, and ZHAO Xin
A new method based on the corner feature and affine transformation is presented in order to realize automatic registration of infrared image and visual image,including corner extraction,edge extraction,corner match and affine transformation.Harris factor is used to detect the corners,and Canny operate is used to extracA new method based on the corner feature and affine transformation is presented in order to realize automatic registration of infrared image and visual image,including corner extraction,edge extraction,corner match and affine transformation.Harris factor is used to detect the corners,and Canny operate is used to extract the edges in two images.The correlation of corner neighborhood is used in edge images to realize coarse corners match.Corners match is refined,and two pairs of corners are chosen as reference point of affine transformation,which are the best in matched corners.The affine transformation model is obtained,and affine transformation in the image prepared for registration is carried out.The experiment results show that the method can well complete automatic registration of infrared image and visual image at a faster registration speed..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3328 (2009)
Audio Watermarking Based on Phase Retrieval Algorithm and Digital Holography
CHEN Da-qing, GU Ji-hua, and TAO Zhi
A new approach of audio watermarking by use of phase retrieval algorithm and digital holography is proposed. The watermarking image is transformed into virtual object wave after phase retrieval algorithm. It interferes with the reference wave to form high contrast Fourier-transformed digital hologram. And the hologram A new approach of audio watermarking by use of phase retrieval algorithm and digital holography is proposed. The watermarking image is transformed into virtual object wave after phase retrieval algorithm. It interferes with the reference wave to form high contrast Fourier-transformed digital hologram. And the hologram is embedded into audio signal by quantification process and discrete-cosine-transform.The watermark can be extracted without the original audio signal and the security key provides a good security. Numerical experiments show that the algorithm is robust against common signal manipulations and attacks,such as lossy compression,re-sampling,low pass filter,noise,and so on..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3333 (2009)
Atmospheric and Oceanic Optics
Inversion Method for Turbulence Profile Based upon Multi-aperture Scintillation Sensor
NI Zhi-bo, HUANG Hong-hua, HUANG Yin-bo, YUAN Ke-e, and RAO Rui-zhong
Based on the theory of multi-aperture scintillation sensor,the contribution of aperture filter function and spectral response function to weighting function are discussed,respectively.According to simulation results of scintillation with Hufnagel-Valley 5/7 model included bounding layer,vertical turbulence profile is iBased on the theory of multi-aperture scintillation sensor,the contribution of aperture filter function and spectral response function to weighting function are discussed,respectively.According to simulation results of scintillation with Hufnagel-Valley 5/7 model included bounding layer,vertical turbulence profile is inversed with the method of singular value decomposition.The magnitudes of the vertical inversion results are between and ，and decreases with height increased,which are all in accord with academic model.Using the measuring results of Shack-Hartman,horizontal turbulence profile is inversed,the transmission distance of which is 1 km.The magnitudes of horizontal inversion results are between 10-14 and 10-15，and the tendency accords the practice condition of experimental site depending on propagation distance,and accords the ensemble average depending on time..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3269 (2009)
Influence of Fog on Atmospheric Laser Communication System and the Relevant Methods
WANG Yong, YU Lei, ZHANG Ya-bin, and CAO Jia-nian
The causes of fog,the relevant mathematical models and its influence on atmospheric laser communication system are analyzed.In order to overcome the influence of fog on wireless optical communication link,the LDPC codes as channel coding are applied into atmospheric laser communication system,and it is simulated in theThe causes of fog,the relevant mathematical models and its influence on atmospheric laser communication system are analyzed.In order to overcome the influence of fog on wireless optical communication link,the LDPC codes as channel coding are applied into atmospheric laser communication system,and it is simulated in the foggy atmospheric channel with combination of BP iterative decoding algorithm and sub-carrier PSK intensity modulation.The simulation results show that LDPC codes have excellent error correction capabilities and access to a larger coding gain,and the proposed scheme can satisfy the need of atmospheric laser communication system..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3275 (2009)
Estimation of Random Errors for Backscatter Lidar Observations
TAO Zong-ming, ZHANG Qing-ze, FANG Xin, WANG Shao-lin, CAO Kai-fa, HU Shun-xing, JI Yu-feng, and HU Huan-ling
Based on the analysis of random errors and characteristic of lidar data,a new method of estimating random errors is introduced,which is called noise scale factor method.Using background signals in far range in one measurement,the noise scale factor is obtained,and the uncertainty of lidar signals at any distances can bBased on the analysis of random errors and characteristic of lidar data,a new method of estimating random errors is introduced,which is called noise scale factor method.Using background signals in far range in one measurement,the noise scale factor is obtained,and the uncertainty of lidar signals at any distances can be estimated.The experiment results show that this method is reliable and feasible..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3279 (2009)
Fiber Optics and Optical Communications
Fabrication and Characterization of Polystyrene-polymethylmethacrylate-based Square-array Microstructured Fiber
GUO Zhao-long, and WANG Li-li
Square-array microstructured polymer optical fibers with polystyrene core and polymethylmethacrylate cladding are fabricated.The image and grating function of the fiber are investigated with home-made specialized system.This new type of fiber provides strong potential for applications in imaging fiber and grating measuSquare-array microstructured polymer optical fibers with polystyrene core and polymethylmethacrylate cladding are fabricated.The image and grating function of the fiber are investigated with home-made specialized system.This new type of fiber provides strong potential for applications in imaging fiber and grating measuring..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3176 (2009)
Experimental Study of 42.8 Gbit/s Differential Phase-shift Keying Signal WDM Transmission
WU Lin, LIU Liang, ZHANG Fan, CHEN Zhang-yuan, and XU An-shi
The three-channel transmission of 42.8 Gbit/s nonreturn-to-zero differential phase-shift keying (NRZ-DPSK) signal is demonstrated.The 410 km transmission link consists of four spans using standard single-mode fiber (SSMF).The dispersion compensation fiber (DCF) and erbium-doped fiber amplifier/distributed raman amplifiThe three-channel transmission of 42.8 Gbit/s nonreturn-to-zero differential phase-shift keying (NRZ-DPSK) signal is demonstrated.The 410 km transmission link consists of four spans using standard single-mode fiber (SSMF).The dispersion compensation fiber (DCF) and erbium-doped fiber amplifier/distributed raman amplifier (EDAF/DRA) hybrid amplification are used.Both optical power spectrum and eye diagrams of the DPSK signal are given in back-to-back configuration and after transmission (center channel).The curves of bit error rate (BER) of the center channel also is given,both in back-to-back configuration and after transmission,which is compared with the curve in single-channel transmission configuration.The BER of the DPSK signal of the center channel is 1.0E-3 after transmission using single-ended detection.张帆|fzhang@pku.edu.cn.
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3180 (2009)
A Controlled Quantum Teleportation Scheme of a Three-particle Unknown State in General Form
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A controlled teleportation scheme of a three-particle arbitrary state is proposed,in which a seven-particle entangled state is used as quantum channel.After projective measurement,the sender announces measurement results.Under the control of the controller,the receiver performs unitary operations on particles to reconsA controlled teleportation scheme of a three-particle arbitrary state is proposed,in which a seven-particle entangled state is used as quantum channel.After projective measurement,the sender announces measurement results.Under the control of the controller,the receiver performs unitary operations on particles to reconstruct the original state.Using the controlled teleportation scheme,some controlled quantum communication protocols can be realized..
Acta Photonica Sinica
- Publication Date: Aug. 27, 2021
- Vol. 38, Issue 12, 3185 (2009)
Optical Field Evolution and Transmission Characteristics of Ultra-short Pulse in the Tapered Region of a Single-mode Tapered Fiber
YU Zhi-qiang, CHEN Yong-zhu, and ZHOU Jian-ying
Propagation constant and field evolution in the tapered region are discussed using numerical method based on waveguide theory.GNSE is resolved by the split-step Fourier method to study the transmission characteristics of ultra-short pulse in the tapered region.The calculated results show that at the beginning of the taPropagation constant and field evolution in the tapered region are discussed using numerical method based on waveguide theory.GNSE is resolved by the split-step Fourier method to study the transmission characteristics of ultra-short pulse in the tapered region.The calculated results show that at the beginning of the tapered fiber,propagation constant decreases gradually while in the end it drops dramatically.After the “transition point”,energy redistributes in the fiber,and it becomes very large in the end.It is found that pulse width is broadened along the tapered region when the pulse width is smaller than 80fs..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3188 (2009)
Changing Inscribed Bragg Wavelengths with Biprism in Phase Mask Technique
LI Chuan, WAN Zhou, XU Jiang-chun, XU Xiao-ping, and CHEN Yan
A rotatable biprism is introduced in phase mask technique to change the inscribed Bragg of grating.In this system,the gratings are inscribed by the UV interference fringes of 248 nm derived from a rotatable biprism,where the phase mask is used as a beam splitter,and the biprism is rotated to change the intersection angA rotatable biprism is introduced in phase mask technique to change the inscribed Bragg of grating.In this system,the gratings are inscribed by the UV interference fringes of 248 nm derived from a rotatable biprism,where the phase mask is used as a beam splitter,and the biprism is rotated to change the intersection angle of two beams.For initializing the reference quantity of Bragg wavelength,the vertex angles of the biprism are determined by the ±1 diffraction angle of phase mask and the refract index of the biprism.Because the change of grating period caused by the asymmetrical rotation of two beams is limited to 5×10-4 nm at a tunability of the Bragg wavelength of ~100 nm,the tilt of grating caused by the rotation of the biprism can be ignorable.As the shift of Bragg wavelength is 1 nm,the maximum rotation angle of the prism is ~1 degree,and the minimum rotation angle is ~3 min.By contrasting with the rotation angle ~23 s/nm of the mirror in Talbot interferometer,the rotation precision of the prisms is decreased by two or three orders of magnitude in this phase mask interferometer..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3194 (2009)
Stimulated Raman Scattering and Its Suppression in a Single-mode Fiber Induced by High-power Nanosecond Optical Pulse
LI Ya-bin, JIA Dong-fang, PANG Song-tao, LIU Yang, ZHAO Chuan, WANG Zhao-ying, GE Chun-feng, and LI Shi-chen
The influence of stimulated Raman scattering (SRS) on high-power (peak power ~1 000 W) pulse with a pulse-width of ~1 ns propagating in a single-mode fiber is investigated numerically by solving coupled nonlinear Schrdinger equations including Raman gain,pump depletion,self-phase modulation,cross-phase modulation and The influence of stimulated Raman scattering (SRS) on high-power (peak power ~1 000 W) pulse with a pulse-width of ~1 ns propagating in a single-mode fiber is investigated numerically by solving coupled nonlinear Schrdinger equations including Raman gain,pump depletion,self-phase modulation,cross-phase modulation and group velocity dispersion.The evolution of input pulse and Stokes pulse is analyzed,and suppression of SRS using large mode area fiber is shown.The results show that SRS can be suppressed effectively when using photonic crystal fiber (PCF) as transmission medium for inertial confined fusion (ICF).Compared to conventional single-mode fiber,the signal loss is smaller,and the central-dip in output pulse is lower..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3198 (2009)
Simulation and Analysis of Dual-channel Optical Transmissions Using SOA-based All-optical Polarization Modulations
WANG Ying, WANG Lu-tang, FANG Nian, ZHAO Li, and HUANG Zhao-ming
A theoretical model of a dual-channel polarization optical transmission system is analyzed,using two semiconductor optical amplifiers (SOAs) to achieve all-optical polarization modulations with two input data streams.In this model,the signal polarization modulation is completed by utilizing the cross polarization modulA theoretical model of a dual-channel polarization optical transmission system is analyzed,using two semiconductor optical amplifiers (SOAs) to achieve all-optical polarization modulations with two input data streams.In this model,the signal polarization modulation is completed by utilizing the cross polarization modulation (XPolM) effect in the SOA.A rate equation of the tensile-strained bulk SOA is adopted in the model.With this model,the dynamic characteristics of the system in respects of the amplification and the phase difference of the probe light in SOAs,signal polarization multiplexing and demultiplexing are investigated numerically.The simulated and experimental results are well consistent..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3203 (2009)
The Effects of Recording Modes to the Formation of Holographic Grating in Photopolymer
ZHANG Tao, TAO Shi-quan, ZHAI Qian-li, and SONG Wei
Based on the recording mechanism of photopolymer,the effect of different recording modes on the diffraction efficiency of gratings was investigated.The existing first-harmonic diffusion model of grating formation in photopolymer was simplified,then the analytic expressions of refractive index modulation for holographicBased on the recording mechanism of photopolymer,the effect of different recording modes on the diffraction efficiency of gratings was investigated.The existing first-harmonic diffusion model of grating formation in photopolymer was simplified,then the analytic expressions of refractive index modulation for holographic exposure,dark enhancement and uniform post-exposure were educed.The kinetics of refractive index modulation for these three recording modes under different exposure intensities were numerically simulated by using the analytic expressions.Experiments were done in a new blue-sensitized photopolymer material.The gratings were recorded by different recording modes with exposure intensities of 4 mW/cm2 and 2 mW/cm2 respectively.The results showed that if the intensity was high,the dark enhancement mode yielded to a high saturated refractive index modulation,while uniform post-exposure made the course of saturation fast..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3209 (2009)
Physical Optics
Realization of Biaxial Crystal Dynamic Outer Conic Refraction by Using Iris
LING Ming, DONG Yuan, JIN Guang-yong, and LIANG Zhu
The biaxial crystal dynamic outer conical refraction is obtaieded.After using kNbO3 and the solid-state laser emitted green beam,the transmission aperture of iris located in the back surface of aplanatic cemented double lens,is alternated in order to carry out that the incident light convergent angle modulate the outerThe biaxial crystal dynamic outer conical refraction is obtaieded.After using kNbO3 and the solid-state laser emitted green beam,the transmission aperture of iris located in the back surface of aplanatic cemented double lens,is alternated in order to carry out that the incident light convergent angle modulate the outer conic refraction angle,so that the angle expression about outer conic refraction of biaxial crystal kNbO3 is accomplished.The experiment shows that the outer conical refraction angle synchronously varies when the size of iris aperture is alternated in periods and the angle is equal to the convergence angle of the beams,which incident to the end face of the biaxial crystal.The biaxial crystal dynamic outer conic refraction can be applied in the fields of laser radar and photric scanning.The theory calculation is coincident with the tested data..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3261 (2009)
Magnetic-field-induced Diffraction Properties of Light by Water-based Magnetic Liquids
LIU Ming, PU Sheng-li, SUN Guo-qing, DAI Min, and GU Zheng-tian
An experimental setup is designed to investigate the field-induced static and dynamic diffraction properties.The corresponding diffraction properties are investigated quantitatively by putting a diaphragm with an appropriate aperture behind the sample.By moving aperture along diffraction to study quantitatively the spaAn experimental setup is designed to investigate the field-induced static and dynamic diffraction properties.The corresponding diffraction properties are investigated quantitatively by putting a diaphragm with an appropriate aperture behind the sample.By moving aperture along diffraction to study quantitatively the spatial distribution of light diffraction.An exponentially decaying function is applied to fit the experimental data of the dynamic diffraction,and the corresponding characteristic time is obtained.The dependence of the field-induced diffraction properties on the magnetic field strength and the sample concentration is investigated.The static and dynamic light diffraction of the field induced magnetic liquid structure depends on magnetic field intensity and the concentration of magnetic fluid.The relationship between diffraction and external static magnetic field strength is non-monotonic.The dynamic diffraction’s characteristic time is inversely proportional to the intensity of external magnetic field and directly proportional to the concentration of magnetic fluid..
Acta Photonica Sinica
- Publication Date: Aug. 25, 2021
- Vol. 38, Issue 12, 3264 (2009)
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