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Chinese Journal of Quantum Electronics
Contents
2007
Volume: 24 Issue 1
25 Article(s)
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Research Article
Millimeter-wave radiometric image target location technology
Long YUAN, Zhong-ke YIN, and Qing XIAO
Aimed at target location,a metal target location algorithm based on region labeling for millimeter-wave radiometric image is proposed,which analyzes millimeter-wave radiometric characteristics of metal and the attribute of millimeter-wave radiometric image. Furthermore,metal targets in the image are segmented through r
Aimed at target location,a metal target location algorithm based on region labeling for millimeter-wave radiometric image is proposed,which analyzes millimeter-wave radiometric characteristics of metal and the attribute of millimeter-wave radiometric image. Furthermore,metal targets in the image are segmented through region labeling,then the criterion on the basis of area is introduced to exclude false target. Finally,the metal targets are located accurately by the calculating method of the center. Experimental results show that the algorithm can detect single metal target as well as multiple metal targets. Besides,whatever shape of the target is,central coordinates of the target can be required precisely. Therefore,it provides a base for target selection and tracking..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 1 (2007)
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1/f fractal noise attenuation using multiscale Kalman filter
Qiang LI, and Qi-shen WANG
A multiscale Kalman filter based on wavelet is proposed for signal restoration embedded in 1/f fractal noise. First,the signal with 1/f fractal noise is transformed into multiscale subsystems in time-scale domain. Some nonstationary properties of fractal signals are attenuated in each subband by wavelet multiresolution
A multiscale Kalman filter based on wavelet is proposed for signal restoration embedded in 1/f fractal noise. First,the signal with 1/f fractal noise is transformed into multiscale subsystems in time-scale domain. Some nonstationary properties of fractal signals are attenuated in each subband by wavelet multiresolution decomposition,so that the Kalman filter bank can be applied to estimate the multiscale input signals. Then the estimated multiscale input signals are synthesized to obtain the estimated signal. Some simulation examples are given for testing the performance of the proposed algorithm and output signal to noise ratio is improved evidently..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 7 (2007)
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Method for measurement of tumor in medical image
Guo-li LI, Na DENG, Cun-gang HU, and Ren-he ZONG
Measurement of tumor is a significant index in clinical diagnosis and radiotherapy. First the tumor area is calculated by polygonal approximation,some value of area are approximated by Tchebyshev multinomial algorithm to get the expression about the change of area,then the volume of tumor is obtained by integral in the
Measurement of tumor is a significant index in clinical diagnosis and radiotherapy. First the tumor area is calculated by polygonal approximation,some value of area are approximated by Tchebyshev multinomial algorithm to get the expression about the change of area,then the volume of tumor is obtained by integral in the CT scope which contains the tumor. This method has higher precision and lower data quantity. The experimental results verify the reliability of the proposed method..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 13 (2007)
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Non-paraxial corrections of scalar diffraction theory
Fei WANG, Xiao-jiu DENG, Cai-xia LIU, and Li-sha XIE
It is well known that the paraxial approximation is no longer valid for the beams with large divergence angle or small spot size comparable with the wavelength. Thus,a rigorous non-paraxial treatment becomes necessary. For the aperture diffractions,the high-order series expansion corrections are not very good if the pr
It is well known that the paraxial approximation is no longer valid for the beams with large divergence angle or small spot size comparable with the wavelength. Thus,a rigorous non-paraxial treatment becomes necessary. For the aperture diffractions,the high-order series expansion corrections are not very good if the propagation distance z is relatively long,because contributions due to the high-frequency components cannot be neglected. Therefore its applicable range is very limited. Based on the scalar diffraction theory of the angular spectrum representation,detailed numerical calculation for the circular aperture diffraction is given,and the non-paraxial corrections to the paraxial solution are derived. It is pointed out that the higher-order non-paraxial corrections are necessary in the near field or in the non-paraxial area. Also,their validity is studied..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 17 (2007)
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Spectral changes of partially coherent light beam diffracted by a knife-edge
Lian-zhou RAO, Zi-yang CHEN, and Ji-xiong PU
Starting from propagation law of partially coherent light beam,the expression for the spectrum of partially coherent light diffracted by a knife-edge in the far field was derived. Base on this expression,the spectra in the diffraction field were investigated theoretically. It is shown that the spectrum in the diffracti
Starting from propagation law of partially coherent light beam,the expression for the spectrum of partially coherent light diffracted by a knife-edge in the far field was derived. Base on this expression,the spectra in the diffraction field were investigated theoretically. It is shown that the spectrum in the diffraction field changes with the location of the observation point,and for a fixed observation point,the spectrum varies with the spatial coherence of the partially coherent light beam and the ratio of transmission..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 22 (2007)
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Analysis of eigenmodes for asymmetric resonant micro-cavities
Jia-xing CAI, Shan-liang QIU, Yong-ping LI, and Zheng-fu HAN
The study of mode characteristics is a foundation for various applications of microcavity. The finite difference time domain(FDTD)technique is used to obtain the responce characteristics of cavity-mode spectra. The FDTD technique is demonstrated in the case of plane-parallel cavity,and the numerical results can coincid
The study of mode characteristics is a foundation for various applications of microcavity. The finite difference time domain(FDTD)technique is used to obtain the responce characteristics of cavity-mode spectra. The FDTD technique is demonstrated in the case of plane-parallel cavity,and the numerical results can coincide well with the theory results. The whisper gallery mode(WGM)characteristics of the plane-circular cavity are analyzed,and the results indicate that wavelength-scale cavities have good mode-selecting power. The detailed research on plane asymmetric resonant cavities composed of two arched boundary under different deformation parameter indicates that by changing the cavity shape the purpose of improving the performances of microcavities can be achieved. The results also show that it is a practical way to optimize the performance of cavities by optimizing cavity shape..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 27 (2007)
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Choice of resonant cavity for LD end-pumped solid-state lasers
Ding-er WU, Cai-fan YAN, and Guang-yin ZHANG
It is systematically analyzed that the effect,for the output and mode of lasers,of structure and correlative parameters of the three kind of resonators(flat-flat resonator,left concave-right flat resonator and right concave-left flat resonator)and left convex-right flat resonator of LD end-pumped solid-state lasers by
It is systematically analyzed that the effect,for the output and mode of lasers,of structure and correlative parameters of the three kind of resonators(flat-flat resonator,left concave-right flat resonator and right concave-left flat resonator)and left convex-right flat resonator of LD end-pumped solid-state lasers by the theory of transmit and transform circle. It is educed that laser with the shorter resonator outputs greater and the mode of laser beam is TM
00
,and solid-state lasers with the left concave-right flat resonator and left convex-right flat resonator have the function of optical ballast. The result of experimenting with the solid state laser for the flat-flat resonator tallies with the analysis conclusion by the method of transmit and transform circle..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 32 (2007)
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Theoretical analysis of timing jitter in the mode-locked solid-state Cr
4+
∶YAG laser pulse
Xian-lun YU, Wei-wei ZHAO, Bo-jun YANG, and Li YU
The applications of the mode-locked solid-state laser in many aspects are limited by the pulse stabilization. The non-linear Schr?dinger equation including noise is obtained from the pulse propagation equation of the passive mode-locked Cr4+∶YAG laser,and the pulse transmission of timing form in the laser cavity is ana
The applications of the mode-locked solid-state laser in many aspects are limited by the pulse stabilization. The non-linear Schr?dinger equation including noise is obtained from the pulse propagation equation of the passive mode-locked Cr
4+
∶YAG laser,and the pulse transmission of timing form in the laser cavity is analyzed. The linear perturbation equations of the pulse parameters in the mode-locked Cr
4+
∶YAG laser is found,and the equations of motion for the pulse parameters perturbation are obtained,and the root-mean-square fluctuation of the pulse timing and phase is derived. The experiment method of reduced timing jitter in the mode-locked solid-state Cr
4+
∶YAG laser is proposed. The results show that the modelocked solid-state Cr
4+
∶YAG laser can be used in the fiber communication and the quantum communication..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 38 (2007)
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Theoretical and experimental study of passively mode-locked Nd
3+
∶YAG laser with corner cube
Wei-qing GAO, Gong-min YAO, Li-xin XU, Yong CHENG, Hai MING, and Jian-ping XIE
Theoretical and experimental study of passively mode-locked Nd3+∶YAG laser is reported. Light intensity in cavity that changes with the rotation of corner cube is analyzed and the numerical simulation results are provided. By using polarization,pulse output of linear polarization state is obtained. By rotating the corn
Theoretical and experimental study of passively mode-locked Nd
3+
∶YAG laser is reported. Light intensity in cavity that changes with the rotation of corner cube is analyzed and the numerical simulation results are provided. By using polarization,pulse output of linear polarization state is obtained. By rotating the corner cube to vary the polarization and the intensity in cavity,we can change the pulse state from passive mode-locking to Q-switching. It is in agreement with theoretical analysis..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 43 (2007)
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Discharge characteristics of a novel discharge configuration for mini-laser
Chao JIANG, and You-qing WANG
A novel mini-device was designed on the base of the configuration of micro-hollow cathode sustained glow discharge(MCSD). The discharge experiment was carried out with air,and the stable direct-current glow discharge was formed at pressure up to 66.7 kPa. The voltage-current characteristics showed a positive slope,and
A novel mini-device was designed on the base of the configuration of micro-hollow cathode sustained glow discharge(MCSD). The discharge experiment was carried out with air,and the stable direct-current glow discharge was formed at pressure up to 66.7 kPa. The voltage-current characteristics showed a positive slope,and the discharges can operate stably without individual ballasting resistors. The estimated current density is 0.048 A/cm
2
,and the estimated power density is 52.8 W/cm
3
at 40 kPa and 60 mA. The estimated electron density is 2.7×10
13
cm
-3
in the discharge plasmas. The high-pressure,large-volume,high electron density plasmas can be used as the media of mini-laser..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 48 (2007)
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A new quantum teleportation circuit
Xiao-ming ZHANG, Guang-jun XIE, and Han XIAO
Quantum teleportation is a typical quantum communication mode which transmitting quantum states in virtue of classical auxiliary methods where the quantum entanglement is introduced. There are many quantum circuit forms to realize teleportation,a new circuit with more compact construction is proposed in this paper base
Quantum teleportation is a typical quantum communication mode which transmitting quantum states in virtue of classical auxiliary methods where the quantum entanglement is introduced. There are many quantum circuit forms to realize teleportation,a new circuit with more compact construction is proposed in this paper based on Brassard's circuit in order to transmit the quantum states effectively..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 54 (2007)
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Preparation of multiple separate cavity fields entanglement in cavity QED
Shu-shu LIU, and Xiang LIU
We present a scheme to produce a maximally entangled state of multiple separate cavity fields based on the resonant interaction of a single-mode cavity field and a three-level atom. Firstly we investigate the entanglement of two separate cavity fields,and then generalize this scheme with maximally entangled states to m
We present a scheme to produce a maximally entangled state of multiple separate cavity fields based on the resonant interaction of a single-mode cavity field and a three-level atom. Firstly we investigate the entanglement of two separate cavity fields,and then generalize this scheme with maximally entangled states to multiple separate cavity fields..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 59 (2007)
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Quantum properties of atom and two-mode filed with intrinsic decoherence
Xia TAN, Cheng-qiang ZHANG, and Yun-jie XIA
The atomic population inversion in the system of a two-mode SU(l,l)coherent field interacting with a two-level atom is investigated by solving Milburn equation. The effects on the atomic population inversion induced by the intrinsic decoherence,the two-mode photon number and the mean photon number are analyzed. The res
The atomic population inversion in the system of a two-mode SU(l,l)coherent field interacting with a two-level atom is investigated by solving Milburn equation. The effects on the atomic population inversion induced by the intrinsic decoherence,the two-mode photon number and the mean photon number are analyzed. The results show that the collapse and revival phenomena of the atomic population inversion will appear when the two-mode photon number is not zero and will disappear gradually with the decrease of the mean photon number. The collapse and revival phenomena of the atomic population inversion will also appear with the intrinsic decoherence,but the amplitude of the Rabi oscillation will be reduced to zero with the evolution of the time..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 63 (2007)
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Photonic band-gap properties and filtering application of one-dimensional multicomponent photonic crystal
Yi ZHANG, Qi WANG, and Yuan-yuan CHEN
Properties of photonic band-gap in one-dimensional multicomponent photonic crystal were studied by optical transfer matrix method. We mainly analyze the relations of photonic band-gap property with the arrangement,refractive index and geometrical thickness of components. Then the filtering properties of a photonic crys
Properties of photonic band-gap in one-dimensional multicomponent photonic crystal were studied by optical transfer matrix method. We mainly analyze the relations of photonic band-gap property with the arrangement,refractive index and geometrical thickness of components. Then the filtering properties of a photonic crystal narrow band optical filter were investigatel,which is made of two pieces of one-dimensional multicomponent photonic crystals with different photonic band-gap due to the different arrangement of components..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 68 (2007)
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A chaotic communication scheme with quadrature modulation
Hong-bin CHEN, and Jiu-chao FENG
Based on the idea of the Schmidt orthogonalization and the orthogonal chaotic carriers being generated,a chaos-based quadrature modulation communication system is proposed and realized. The results by computer simulation indicate that under the environment of channel noise and multipath interference,for single-user and
Based on the idea of the Schmidt orthogonalization and the orthogonal chaotic carriers being generated,a chaos-based quadrature modulation communication system is proposed and realized. The results by computer simulation indicate that under the environment of channel noise and multipath interference,for single-user and multiuser communications,the proposed system is superior to the CSK and QCSK systems. In addition,the system is simple and easy to implement..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 73 (2007)
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Intersubband optical absorption in hyperbolic quantum wells
Peng TAN, and Hong LU
The problem of optical saturation of intersubband absorption has attracted considerable attention recently. The problem is very important to the development of superlattice devices such as fast infrared detectors and modulators because one needs to know the range of input optical intensities for which linear operation
The problem of optical saturation of intersubband absorption has attracted considerable attention recently. The problem is very important to the development of superlattice devices such as fast infrared detectors and modulators because one needs to know the range of input optical intensities for which linear operation is possible. The linear and the third-order nonlinear optical intersubband absorption coefficients in hyperbolic quantum wells are studied,where emphasis is devoted to the influence of the shape of the wells on the absorption coefficients. The analytic forms for the linear and the third-order nonlinear optical intersubband absorption coefficients are derived by means of the density matrix formalism taking into account the intrasubband relaxation. Finally,the numerical results show that the optical absorption coefficients depend on the shape of the wells,the tunnel bandwith and the optical intensity..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 80 (2007)
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Research on nanostructures fabricated by atom lithography with
52
Cr
Wen-tao ZHANG, and Tong-bao LI
In the nanostructures fabrication technologies,atom lithography has particular advantages. In order to satisfy the requirements of fabrication of nanometer scale structure,we designed an experimental setup for chromium atomic lithography and analysed the chromium atomic sources,laser system,frequency stabilization syst
In the nanostructures fabrication technologies,atom lithography has particular advantages. In order to satisfy the requirements of fabrication of nanometer scale structure,we designed an experimental setup for chromium atomic lithography and analysed the chromium atomic sources,laser system,frequency stabilization system,atom beam collimation system and the deposition results. The frequency stabilization precision reach to 0.26 MHz. By laser cooling,the divergence of the chromium atomic beam was reduced from 4.5 mrad to 0.9 mrad. The resulting nanolines exhibit a period of 234 nm with height of 0.276 nm..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 85 (2007)
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Methods of time-of-flight measurement of altimetry with high resolution
Yang LI, Jun QI, Yi ZHANG, Xin ZHAO, Jie-xiang CHEN, Bi-hai TU, and Xiang-jing WANG
A pulsed time-of-flight laser altimeter operates by transmitting a short laser pulse to an optical visible target and by detecting the reflected pulse by an optical detector. The measured distance is calculated from this flight time. So the accuracy of laser time interval is a basic beacon to measure its system. The te
A pulsed time-of-flight laser altimeter operates by transmitting a short laser pulse to an optical visible target and by detecting the reflected pulse by an optical detector. The measured distance is calculated from this flight time. So the accuracy of laser time interval is a basic beacon to measure its system. The technology of distance measurement is discussed. The shortage of traditional measurements is introduced. Using coarse and fine measurements together to meet the requirement of large range and high resolution. The following methods are described: analogue interpolation method,the Vernier method,tapped delay lines. Special attention has been paid to converters utilizing integrated delay lines for digital conversion of TIs,include using designs with phase-locked loop and delay-locked loop circuits in FPGA..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 89 (2007)
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Time-of-flight measurements with TDC-GP1 in laser altimeter
Xin ZHAO, Jun QI, Bi-hai TU, Jie-xiang CHENG, Yi ZHANG, Ji LI, Jian-guo LIU, and Ping-jian ZHAO
Pulsed time-of-flight laser altimeter operates by transmitting a short laser pulse to an optical visible target and by detecting the reflected pulse with an optical detector. The measured distance is calculated from this flight time. So the accuracy of laser time interval is a basic beacon to measure its system capabil
Pulsed time-of-flight laser altimeter operates by transmitting a short laser pulse to an optical visible target and by detecting the reflected pulse with an optical detector. The measured distance is calculated from this flight time. So the accuracy of laser time interval is a basic beacon to measure its system capability. We use a special time-digital-converter chip to develop a high resolution time interval module. Based on delay chain,it has high frequency and precision,suffer no outside environmental interference,completely suite for laser altimeter. Finally the soft and hardware realization method and measurement result are given..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 96 (2007)
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Temperature dependence of photoluminescence of quantum dot arrays
Guo-liang LIU, Jiang-hong YAO, Jing-jun XU, and Zhan-guo WANG
The understanding of the temperature dependence of the photoluminescence of multimode quantum dot(QD)arrays is essentially important for the realization of efficient photonic devices. The dynamics processes of different density multimode QD arrays were fitted by using the rate equation model. It is shown that,in high d
The understanding of the temperature dependence of the photoluminescence of multimode quantum dot(QD)arrays is essentially important for the realization of efficient photonic devices. The dynamics processes of different density multimode QD arrays were fitted by using the rate equation model. It is shown that,in high dense QD arrays,the intensity of photoluminescence of different QD families behaves different temperature dependence;the intensity of photoluminescence is quenched as the temperature increases in low density QD arrays. In high dense QD arrays,as the temperature increases,the carriers will be thermally excited into the wetting layer from QDs,and then some of them will be recaptured by the big scale QDs,carriers coupling takes place between the different QD families;in low density QD arrays,the carriers transfer between different QD families will be limited. Temperature dependence of maximum of the ratio of photoluminescence intensity of different QD families strongly depends on the difference of thermal activation energies..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 100 (2007)
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Effect of Auger recombination on the threshold current strained quantum well laser
Guo-zhi JIA, Jiang-hong YAO, Guo-liang LIU, Tian-guo BAI, Ru-bing LIU, and Xiao-dong XING
The temperature dependence of threshold current density is calculated by taking the carrier losses(Auger recombination and non-Auger recombination)into account in strained quantum well lasers. The characteristic temperature and threshold current density are compared between tensile-strained quantum well laser and compr
The temperature dependence of threshold current density is calculated by taking the carrier losses(Auger recombination and non-Auger recombination)into account in strained quantum well lasers. The characteristic temperature and threshold current density are compared between tensile-strained quantum well laser and compressive-strained quantum well laser. There is a conversation temperature point(T
0
)between Auger recombination and non-Auger recombination. When T is higher than T
c
,Auger recombination is leading;T is lower than T
c
,the non-Auger recombination is leading. There is a higher conversation temperature,a lower threshold current density and a higher characteristic temperature in tensile strained quantum well laser than in compressive-strained quantum well laser..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 105 (2007)
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Gamma radiation effects on MWIR HgCdTe FPA device
Yi LIAO, Jian-xin WANG, and Qin-yao ZHANG
The affects of gamma radiation on the performances of thin film HgCdTe MWIR FPA infrared detector is reparted. The different doses of gamma irradiation is 3 ×106 rad,9×106 rad and 2 × 107 rad. The Ⅰ-Ⅴ characteristics,blackbody responses and noise were measured before and after each dose of irradiation. W
The affects of gamma radiation on the performances of thin film HgCdTe MWIR FPA infrared detector is reparted. The different doses of gamma irradiation is 3 ×10
6
rad,9×10
6
rad and 2 × 10
7
rad. The Ⅰ-Ⅴ characteristics,blackbody responses and noise were measured before and after each dose of irradiation. With the total dose increased,the current and noise of the device increased while blackbody responses decreased. The Ⅰ-Ⅴ characteristics were affected by gamma radiation seriously while blackbody responsively and blackbody responses was affected a little. These shows the performances of the device was degenerated as the dose of gamma irradiation increased..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 110 (2007)
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Free space optical communication based on polymer optical fiber LAN system
Yong-sheng ZHANG, Tao ZHANG, Rong-sheng ZHENG, Kai-qun LIN, Zhi-guo XIE, Jie YAN, and Hai MING
A free space optical(FSO)communication system was designed,which is compatible with 125Mbps polymer optical fiber(POF)LAN system. The FSO system realizes multibuilding communication and extends the transmission distance of POF LAN. The system includes emission and receiving part. The emission part is composed of a 650
A free space optical(FSO)communication system was designed,which is compatible with 125Mbps polymer optical fiber(POF)LAN system. The FSO system realizes multibuilding communication and extends the transmission distance of POF LAN. The system includes emission and receiving part. The emission part is composed of a 650 nm laser diode(LD),a drive circus and beam alignment and expand lens. The receiving part is composed of a receiving lens and a photo detector(PD). The modulated emission power of LD is 3 dBm and the sensitivity of PD is-27 dBm. The atmosphere attenuation to 650 nm light and the dot whipping caused by air turbulence were analyzed. The signal transmission waveform and communication eye diagram of the system were recorded. The experiment shows that the transmission distance of POF LAN was extended by FSO,which enables more flexibility of the POF LAN installation..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 114 (2007)
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A vibration sensor using all polarization-maintaining fiber waveguide modulator
Ben-li YU, and Chang-chun XU
In interferometric fiber sensors,there are the problems that the dependence between the modulation depth of laser frequency modulation and the optical path difference,and the high frequency restriction and nonlinear effect of PZT modulation. In order to resolve the restriction and ensure the fidelity-pickup of micro-vi
In interferometric fiber sensors,there are the problems that the dependence between the modulation depth of laser frequency modulation and the optical path difference,and the high frequency restriction and nonlinear effect of PZT modulation. In order to resolve the restriction and ensure the fidelity-pickup of micro-vibration signal,a vibration sensor based on all polarization-maintained fiber Mach-Zednder interferometer is presented,in which a fiber waveguide modulator is set and the single-frequency polarization-maintaining optical fiber laser and the phase generated carrier homodyne demodulation scheme are employed. The use of waveguide modulator increases the flexibility and the frequency response range of the sensor and the sensitivity reaches to 10
-5
rad/Hz
1/2
..
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 118 (2007)
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[in Chinese]
[in Chinese]
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Chinese Journal of Quantum Electronics
Publication Date: Oct. 11, 2021
Vol. 24, Issue 1, 122 (2007)
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