Journals >Chinese Optics Letters
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2011
Volume: 9 Issue 8
25 Article(s)
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Instrumentation, Measurement, and Metrology
Experimental study on minimum resolvable velocity for heterodyne laser Doppler vibrometry
Jianhua Shang, Shuguang Zhao, Yan He, Weibiao Chen, and Ning Jia
A high spatial resolution, high velocity resolution all-fiber laser Doppler vibrometry (LDV) based on heterodyne detection for vibration measurements is reported. A linewidth of 1-kHz single-mode continuous fiber laser, polarization-preserving fiber, and a telescope with 30-mm aperture are used in this LDV. With the inA high spatial resolution, high velocity resolution all-fiber laser Doppler vibrometry (LDV) based on heterodyne detection for vibration measurements is reported. A linewidth of 1-kHz single-mode continuous fiber laser, polarization-preserving fiber, and a telescope with 30-mm aperture are used in this LDV. With the inphase-quadrature circuit and the digital differentiating discriminator, a high velocity resolution of 96.9 nm/s and a high displacement resolution of 2.5 pm are obtained simultaneously with a glass attached to a piezoceramic transducer. These values correspond to the measurement uncertainties of vibration velocity and displacement within 4.14% and 4.6%, respectively..
Chinese Optics Letters
- Publication Date: May. 31, 2011
- Vol. 9, Issue 8, 081201 (2011)
Full-parallax three-dimensional display using new directional diffuser
Shuai Li, Haifeng Li, Zhenrong Zheng, Yifan Peng, Shicong Wang, and Xu Liu
A full-parallax three-dimensional (3D) display using a new directional diffuser is demonstrated. The display could present 3D images with 45 views comprising 9 horizontal views by 5 vertical views. The resolution and size of the 3D images displayed are 226￡226 pixels and 300￡300 (mm). The new directional diffuser consiA full-parallax three-dimensional (3D) display using a new directional diffuser is demonstrated. The display could present 3D images with 45 views comprising 9 horizontal views by 5 vertical views. The resolution and size of the 3D images displayed are 226￡226 pixels and 300￡300 (mm). The new directional diffuser consisting of two perpendicular lenticular sheets can be widely used in the display domain owing to its low cost and simple process..
Chinese Optics Letters
- Publication Date: Jun. 03, 2011
- Vol. 9, Issue 8, 081202 (2011)
Lasers and Laser Optics
6.5-ns actively Q-switched Nd:YVO4 laser operating at 1.34 \mu m
Yongguang Zhao, Zhengping Wang, Haohai Yu, Lei Guo, Lijuan Chen, Shidong Zhuang, Xun Sun, Dawei Hu, and Xinguang Xu
With a plano-concave cavity, diode-pumped continuous-wave (CW) and actively Q-switched Nd:YVO4 laser operating at 1.34 \mu m is demonstrated. Maximum CW output power of 4.76 W and Q-switched average output power of 2.64 W are obtained with output coupler (transmission T=3.9%). For the Q-switching operation, the theoretWith a plano-concave cavity, diode-pumped continuous-wave (CW) and actively Q-switched Nd:YVO4 laser operating at 1.34 \mu m is demonstrated. Maximum CW output power of 4.76 W and Q-switched average output power of 2.64 W are obtained with output coupler (transmission T=3.9%). For the Q-switching operation, the theoretically calculated pulse energy and pulse width, with a pulse repetition frequency (PRF) range of 5–40 kHz, coincide with the experimental results. With a T=11.9% output coupler, the maximum peak power of 24.3 kW and minimum pulse width of 6.5 ns are obtained when the PRF is 10 kHz. To the best of our knowledge, this is the shortest actively Q-switched pulse duration ever obtained in a 1.3-\mu m Nd-doped vanadate laser..
Chinese Optics Letters
- Publication Date: May. 31, 2011
- Vol. 9, Issue 8, 081401 (2011)
Diode-pumped high-efficiency broadband tunable Tm:YAP laser
Yanyan Li, Yi Xu, Yuxin Leng, Hao Zhang, and Yongjun Dong
A laser diode-pumped high-efficiency widely tunable Tm:YAP laser with excellent comprehensive properties is reported. The output power is stable at a given pump power. Under the absorbed pump power of 12.95 W, the maximum output power at 2,010 nm is 5.16 W, corresponding to a slope efficiency of 45.5%. The generated beA laser diode-pumped high-efficiency widely tunable Tm:YAP laser with excellent comprehensive properties is reported. The output power is stable at a given pump power. Under the absorbed pump power of 12.95 W, the maximum output power at 2,010 nm is 5.16 W, corresponding to a slope efficiency of 45.5%. The generated beam profile is close to the Gaussian TEM00 near the maximum pump power. Furthermore, the laser working wavelength can be continuously tuned through optimization from 1,894 to 2,066 nm, which is the widest tunable range for Tm:YAP lasers to date..
Chinese Optics Letters
- Publication Date: Jun. 03, 2011
- Vol. 9, Issue 8, 081402 (2011)
Kinetics analysis of chemiluminescence in discharge-driven HF chemical lasers
Wei Luo, Shengfu Yuan, Baozhu Yan, Qisheng Lu, and Qianjin Zou
The chemiluminescence spectrum in the optical cavity of discharge-driven hydrogen fluoride (HF) chemical laser is measured. The result reveals that the spectra of the helium and fluorine (F) atoms are the major components. Moreover, the green chemiluminescence in the downstream of the optical axis is mostly composed ofThe chemiluminescence spectrum in the optical cavity of discharge-driven hydrogen fluoride (HF) chemical laser is measured. The result reveals that the spectra of the helium and fluorine (F) atoms are the major components. Moreover, the green chemiluminescence in the downstream of the optical axis is mostly composed of the 60P20 spectral line of the HF molecule. The analysis shows that, except for the cold pumping reaction, the recombination of the F atoms and the hot pumping reaction also occur in the optical cavity. Due to the hot pumping reaction and the optical cavity temperature in a specific range, the 60P20 line becomes the strongest HF molecule in the downstream region of the optical axis. After the hot pumping reaction, the green chemiluminescence always appears in the downstream region of the optical axis when the optical cavity temperature varies in a greater range..
Chinese Optics Letters
- Publication Date: Jun. 16, 2011
- Vol. 9, Issue 8, 081403 (2011)
High-power picosecond regenerative amplifier based on CW diode side-pumped Nd:YAG with high beam quality
Hua Lin, Jinfeng Li, Jinping He, and Xiaoyan Liang
A compact high-power picosecond regenerative amplifier based on continuous wave (CW) diode side-pumped Nd:YAG is demonstrated. Average power of 8.8 W is achieved at a repetition rate of 5 kHz at a wavelength of 1 064 nm with a pulse duration of 28 ps, corresponding to a pulse energy of 1.76 mJ and a peak power of 62.9 A compact high-power picosecond regenerative amplifier based on continuous wave (CW) diode side-pumped Nd:YAG is demonstrated. Average power of 8.8 W is achieved at a repetition rate of 5 kHz at a wavelength of 1 064 nm with a pulse duration of 28 ps, corresponding to a pulse energy of 1.76 mJ and a peak power of 62.9 MW. The beam quality is close to the diffraction limit with M2x = 1.24, M2y =1.03. To the best of our knowledge, this is the highest pulse energy obtained from a CW diode pumped Nd:YAG picosecond regenerative amplifier..
Chinese Optics Letters
- Publication Date: Jun. 21, 2011
- Vol. 9, Issue 8, 081404 (2011)
Conductively cooled 1-kHz single-frequency Nd:YAG laser for remote sensing
Juntao Wang, Ren Zhu, Jun Zhou, Huaguo Zang, Xiaolei Zhu, and Weibiao Chen
A conductively cooled, laser diode (LD) end-pumped, injection-seeded single-frequency Nd:YAG laser is designed and implemented. The laser is capable of producing an 8-mJ Q-switched pulse with a 11-ns pulse width at 1 064 nm and at a pulse repetition rate of 1 000 Hz. At the maximum output energy of 8 mJ, the frequency A conductively cooled, laser diode (LD) end-pumped, injection-seeded single-frequency Nd:YAG laser is designed and implemented. The laser is capable of producing an 8-mJ Q-switched pulse with a 11-ns pulse width at 1 064 nm and at a pulse repetition rate of 1 000 Hz. At the maximum output energy of 8 mJ, the frequency jitter is less than 3.5 MHz (root mean square (RMS)) over two minutes, and the linewidth is around 54.2 MHz. The M2 of the laser beam is approximately 1.30 in both horizontal and vertical directions. The optimized ramp-fire technique is applied to build reliable single longitudinal mode oscillating..
Chinese Optics Letters
- Publication Date: Jun. 21, 2011
- Vol. 9, Issue 8, 081405 (2011)
Beam steering of external cavity diode laser by an intracavity electro-optic ceramic deflector
Min Gao, Qing Ye, Zuoren Dong, Zhenglan Bian, Zujie Fang, Haiwen Cai, and Ronghui Qu
A novel beam-steering external cavity diode laser using an intracavity lead lanthanum zirconate titanate (PLZT) electro-optic ceramic deflector is proposed and demonstrated experimentally. The laser consists of a semiconductor laser with single mode fiber coupled output, polarization controller, PLZT electro-optic ceraA novel beam-steering external cavity diode laser using an intracavity lead lanthanum zirconate titanate (PLZT) electro-optic ceramic deflector is proposed and demonstrated experimentally. The laser consists of a semiconductor laser with single mode fiber coupled output, polarization controller, PLZT electro-optic ceramic deflector, and output concave mirror. By applying proper driven electrical signals on the PLZT electro-optic deflector, the beam deflection angle achieves 5.8 mrad at 1 000 V. A high-speed beam-steering property with less than 120-ns switching time is also observed. Moreover, a good beam quality with Gaussian spatial profile and a linear polarization state are obtained..
Chinese Optics Letters
- Publication Date: Jun. 21, 2011
- Vol. 9, Issue 8, 081406 (2011)
Diffraction and Gratings
Multimode resonance bandpass filter with twin wideband channels
Zhenhua Wang, Yonggang Wu, Zihuan Xia, Renchen Liu, Gang Lv, Heyun Wu, and Pinglin Tang
A bandpass filter with twin wideband channels in a single-layer guided-mode resonance grating is presented. Strong refractive-index modulation is used to support the excitation of multimode resonances TE1,0, TE1,1, TE2,0, TE1,2, and TE2,1, which are excited by the first and second diffraction orders, relate asymmetricaA bandpass filter with twin wideband channels in a single-layer guided-mode resonance grating is presented. Strong refractive-index modulation is used to support the excitation of multimode resonances TE1,0, TE1,1, TE2,0, TE1,2, and TE2,1, which are excited by the first and second diffraction orders, relate asymmetrical line shapes and broad low-transmission bands, where TE is the transverse electric. Taking advantage of narrow linewidth and sharp edge line shape in the spectra of TE2, (v is the mode), a bandpass filter with form factors of 0.61 and 0.7 for long- and short-wave channels is presented to demonstrate this concept..
Chinese Optics Letters
- Publication Date: Jun. 16, 2011
- Vol. 9, Issue 8, 080501 (2011)
Optical Devices
Low threshold voltage light-emitting diode in silicon-based standard CMOS technology
Zan Dong, Wei Wang, Beiju Huang, Xu Zhang, Ning Guan, and Hongda Chen
Low-voltage silicon (Si)-based light-emitting diode (LED) is designed based on the former research of LED in Si-based standard complementary metal oxide semiconductor (CMOS) technology. The low-voltage LED is designed under the research of cross-finger structure LEDs and sophisticated structure enhanced LEDs for high eLow-voltage silicon (Si)-based light-emitting diode (LED) is designed based on the former research of LED in Si-based standard complementary metal oxide semiconductor (CMOS) technology. The low-voltage LED is designed under the research of cross-finger structure LEDs and sophisticated structure enhanced LEDs for high efficiency and stable light source of monolithic chip integration. The device size of low-voltage LED is 45.85\times 38.4 (\mu m), threshold voltage is 2.2 V in common condition, and temperature is 27 oC. The external quantum efficiency is about 10^{-6} at stable operating state of 5 V and 177 mA..
Chinese Optics Letters
- Publication Date: May. 31, 2011
- Vol. 9, Issue 8, 082301 (2011)
Study on the saturation characteristics of high-speed uni-traveling-carrier photodiodes based on field screening analysis
Tuo Shi, Bing Xiong, Changzheng Sun, and Yi Luo
A back-illuminated mesa-structure InGaAs/InP charge-compensated uni-traveling-carrier (UTC) photodiode (PD) is fabricated, and its saturation characteristics are investigated. The responsivity of the 40-\mu m-diameter PD is as high as 0.83 A/W, and the direct current (DC) saturation current is up to 275 mA. The 1-dB coA back-illuminated mesa-structure InGaAs/InP charge-compensated uni-traveling-carrier (UTC) photodiode (PD) is fabricated, and its saturation characteristics are investigated. The responsivity of the 40-\mu m-diameter PD is as high as 0.83 A/W, and the direct current (DC) saturation current is up to 275 mA. The 1-dB compression point at the 3-dB cutoff frequency of 9 GHz is measured to be 100 mA, corresponding to an output radio frequency (RF) power of up to 20.1 dBm. According to the calculated electric field distributions in the depleted region under both DC and alternating current (AC) conditions, the saturation of the UTC-PD is caused by complete field screening at high optical injection levels..
Chinese Optics Letters
- Publication Date: May. 31, 2011
- Vol. 9, Issue 8, 082302 (2011)
Uneven splitting-ratio 1 \times 2 multimode interference splitters based on silicon wire waveguides
Jingtao Zhou, Huajun Shen, Rui Jia, Huanming Liu, Yidan Tang, Chengyue Yang, Chunlai Xue, and Xinyu Liu
Two types of 1 \times 2 multi-mode interference (MMI) splitters with splitting ratios of 85:15 and 72:28 are designed. On the basis of a numerical simulation, an optimal length of the MMI section is obtained. Subsequently, the devices are fabricated and tested. The footprints of the rectangular MMI regions are only 3 \Two types of 1 \times 2 multi-mode interference (MMI) splitters with splitting ratios of 85:15 and 72:28 are designed. On the basis of a numerical simulation, an optimal length of the MMI section is obtained. Subsequently, the devices are fabricated and tested. The footprints of the rectangular MMI regions are only 3 \times 18.2 and 3 \times 14.3 (\mu m). The minimum excess losses are 1.4 and 1.1 dB. The results of the test on the splitting ratios are consistent with designed values. The devices can be applied in ultra-compact photonic integrated circuits to realize the "tap" function..
Chinese Optics Letters
- Publication Date: Jun. 16, 2011
- Vol. 9, Issue 8, 082303 (2011)
Fiber Optics and Optical Communications
High channel-count comb f ilter based on multi-concatenated sampled chirped fiber Bragg gratings
Hongwei Yuan, Jun Zhou, Weitao Ma, Yongtang Sun, and Tiefeng Xu
A high channel-count comb filter based on multi-concatenated sampled chirped fiber Bragg gratings (MC-SCFBGs) is proposed and optimally designed by using several chirped gratings with different fundamental grating periods, instead of non-grating sections of SCFBGs. The numerical simulations of the reflection spectra shA high channel-count comb filter based on multi-concatenated sampled chirped fiber Bragg gratings (MC-SCFBGs) is proposed and optimally designed by using several chirped gratings with different fundamental grating periods, instead of non-grating sections of SCFBGs. The numerical simulations of the reflection spectra show that the channel spacing and the channel bandwidth in MC-SCFBGs are smaller than those in multi-concatenated chirped fiber Bragg gratings (MC-CFBGs) and that the spectral bandwidth of MC-SCFBGs can be greatly broadened by increasing the cascade number of the grating sections in each sampling period..
Chinese Optics Letters
- Publication Date: Jun. 03, 2011
- Vol. 9, Issue 8, 080601 (2011)
Label swapping and packet transmission of DPSK-labeled PPM signal in optical label switching
Yan Shi, Qi Zhang, Chongxiu Yu, Xiangjun Xin, Cang Jin, and Rui Zhou
A label swapping scheme of an optical labeled signal with differential phase shift keying (DPSK) for label at 2.5 Gb/s and pulse position modulation (PPM) for payload at 40 Gb/s is demonstrated by simulation. Power penalties of ?1.8 and ?0.8 dB are achieved for both the payload and label over 80-km single mode fiber (SA label swapping scheme of an optical labeled signal with differential phase shift keying (DPSK) for label at 2.5 Gb/s and pulse position modulation (PPM) for payload at 40 Gb/s is demonstrated by simulation. Power penalties of ?1.8 and ?0.8 dB are achieved for both the payload and label over 80-km single mode fiber (SMF) transmission. This labeling scheme allows the use of four-wave mixing (FWM) in semiconductor optical amplifier (SOA) to perform label erasure, with advantages of transparence for bit rate, high processing rate, simple architecture, and low cost. Label swapping is demonstrated with appropriate penalties of ?3.5 and 0.8 dB for PPM payload and new DPSK label, respectively. To further prove the effectiveness of the proposed scheme, label swapping in the case of using 10-Gb/s DPSK label is also investigated with the power penalties of 6 and 2 dB for PPM payload and new DPSK label..
Chinese Optics Letters
- Publication Date: Jun. 03, 2011
- Vol. 9, Issue 8, 080602 (2011)
Imaging Systems
Analysis of the deviation of the dif fracted beams caused by acousto-optic tunable filter in multispectral imaging
Yu Yang, Xuejun Sha, and Zhonghua Zhang
The deviation caused by acousto-optic tunable filter (AOTF) diffraction in multispectral imaging is analyzed through derivation calculus of the deviation angle. The rotatory polarization of acousto-optic crystal is taken into account in this analysis. The relationships between the polar angle of the incident and the diThe deviation caused by acousto-optic tunable filter (AOTF) diffraction in multispectral imaging is analyzed through derivation calculus of the deviation angle. The rotatory polarization of acousto-optic crystal is taken into account in this analysis. The relationships between the polar angle of the incident and the diffracted beams are acquired by using the momentum-matching condition. During the diffraction of the incident beams, far more deviations are induced..
Chinese Optics Letters
- Publication Date: May. 31, 2011
- Vol. 9, Issue 8, 081101 (2011)
Performance of third-order ghost imaging with second-order intensity correlation
Bin Cao, Chunxi Zhang, and Pan Ou
The third-order ghost imaging with the second-order intensity correlation is theoretically and experimentally demonstrated. The resolution and visibility of the reconstructed image are discussed, and the relationship between resolution and visibility is analyzed. The theoretical results show that a tradeoff exists betwThe third-order ghost imaging with the second-order intensity correlation is theoretically and experimentally demonstrated. The resolution and visibility of the reconstructed image are discussed, and the relationship between resolution and visibility is analyzed. The theoretical results show that a tradeoff exists between the visibility and resolution of the reconstructed image; the better the image resolution, the worse the image visibility. Numerical simulations are carried out to verify this theory, and a ghost imaging experiment is conducted to validate our calculations. The experimental results agree with the theoretical predictions..
Chinese Optics Letters
- Publication Date: May. 31, 2011
- Vol. 9, Issue 8, 081102 (2011)
Machine Vision
Pose measurement method based on geometrical constraints
Zimiao Zhang, Changku Sun, Pengfei Sun, and Peng Wang
The pose estimation method based on geometric constraints is studied. The coordinates of the five feature points in the camera coordinate system are calculated to obtain the pose of an object on the basis of the geometric constraints formed by the connective lines of the feature points and the coordinates of the featurThe pose estimation method based on geometric constraints is studied. The coordinates of the five feature points in the camera coordinate system are calculated to obtain the pose of an object on the basis of the geometric constraints formed by the connective lines of the feature points and the coordinates of the feature points on the CCD image plane; during the solution process, the scaling and orthography projection model is used to approximate the perspective projection model. The initial values of the coordinates of the five feature points in the camera coordinate system are obtained to ensure the accuracy and convergence rate of the non-linear algorithm. In accordance with the perspective projection characteristics of the circular feature landmarks, we propose an approach that enables the iterative acquisition of accurate target poses through the correction of the perspective projection coordinates of the circular feature landmark centers. Experimental results show that the translation positioning accuracy reaches ±0.05 mm in the measurement range of 0–40 mm, and the rotation positioning accuracy reaches ±0.06o in the measurement range of 4o–60o..
Chinese Optics Letters
- Publication Date: Jun. 16, 2011
- Vol. 9, Issue 8, 081501 (2011)
OPTICAL DATA STORAGE
Laser direct writing pattern structures on AgInSbTe phase change thin film
Aihuan Dun, Jingsong Wei, and Fuxi Gan
Different pattern structures are obtained on the AgInSbTe (AIST) phase change film as induced by laser beam. Atomic force microscopy (AFM) was used to observe and analyze the different pattern structures. The AFM photos clearly show the gradually changing process of pattern structures induced by different threshold effDifferent pattern structures are obtained on the AgInSbTe (AIST) phase change film as induced by laser beam. Atomic force microscopy (AFM) was used to observe and analyze the different pattern structures. The AFM photos clearly show the gradually changing process of pattern structures induced by different threshold effects, such as crystallization threshold, microbump threshold, melting threshold, and ablation threshold. The analysis indicates that the AIST material is very effective in the fabrication of pattern structures and can offer relevant guidance for application of the material in the future..
Chinese Optics Letters
- Publication Date: May. 31, 2011
- Vol. 9, Issue 8, 082101 (2011)
Thin Films
Effect of standing-wave field distribution on femosecond laser-induced damage of HfO2/SiO2 mirror coating
Shunli Chen, Yuan’an Zhao, Hongbo He, and Jianda Shao
Single-pulse and multi-pulse damage behaviors of "standard" (with \lambda/4 stack structure) and "modified" (with reduced standing-wave field) HfO2/SiO2 mirror coatings are investigated using a commercial 50-fs, 800-nm Ti:sapphire laser system. Precise morphologies of damaged sites display strikinglSingle-pulse and multi-pulse damage behaviors of "standard" (with \lambda/4 stack structure) and "modified" (with reduced standing-wave field) HfO2/SiO2 mirror coatings are investigated using a commercial 50-fs, 800-nm Ti:sapphire laser system. Precise morphologies of damaged sites display strikingly different features when the samples are subjected to various number of incident pulses, which are explained reasonably by the standing-wave field distribution within the coatings. Meanwhile, the single-pulse laser-induced damage threshold of the "standard" mirror is improved by about 14% while suppressing the normalized electric field intensity at the outmost interface of the HfO2 and SiO2 layers by 37%. To discuss the damage mechanism, a theoretical model based on photoionization, avalanche ionization, and decays of electrons is adopted to simulate the evolution curves of the conduction-band electron density during pulse duration..
Chinese Optics Letters
- Publication Date: May. 31, 2011
- Vol. 9, Issue 8, 083101 (2011)
Image Processing
Sub-pixel processing for super-resolution scanning imaging system with f iber bundle coupling
Bowen An, Bingbin Xue, Shengda Pan, and Guilin Chen
A multilayer fiber bundle is used to couple the image in a remote sensing imaging system. The object image passes through all layers of the fiber bundle in micro-scanning mode. The malposition of adjacent layers arranged in a hexagonal pattern is at sub-pixel scale. Therefore, sub-pixel processing can be applied to impA multilayer fiber bundle is used to couple the image in a remote sensing imaging system. The object image passes through all layers of the fiber bundle in micro-scanning mode. The malposition of adjacent layers arranged in a hexagonal pattern is at sub-pixel scale. Therefore, sub-pixel processing can be applied to improve the spatial resolution. The images coupled by the adjacent layer fibers are separated, and subsequently, the intermediate image is obtained by histogram matching based on one of the separated image called base image. Finally, the intermediate and base images are processed in the frequency domain. The malposition of the adjacent layer fiber is converted to the phase difference in Fourier transform. Considering the limited sensitivity of the experimental instruments and human sight, the image is set as a band-limited signal and the interpolation function of image fusion is found. The results indicate that a super-resolution image with ultra-high spatial resolution is obtained..
Chinese Optics Letters
- Publication Date: Jun. 16, 2011
- Vol. 9, Issue 8, 081001 (2011)
Novel averaging window f ilter for SIFT in infrared face recognition
Junfeng Bai, Yong Ma, Jing Li, Fan Fan, and Hongyuan Wang
The extraction of stable local features directly affects the performance of infrared face recognition algorithms. Recent studies on the application of scale invariant feature transform (SIFT) to infrared face recognition show that star-styled window filter (SWF) can filter out errors incorrectly introduced by SIFT. TheThe extraction of stable local features directly affects the performance of infrared face recognition algorithms. Recent studies on the application of scale invariant feature transform (SIFT) to infrared face recognition show that star-styled window filter (SWF) can filter out errors incorrectly introduced by SIFT. The current letter proposes an improved filter pattern called Y-styled window filter (YWF) to further eliminate the wrong matches. Compared with SWF, YWF patterns are sparser and do not maintain rotation invariance; thus, they are more suitable to infrared face recognition. Our experimental results demonstrate that a YWF-based averaging window outperforms an SWF-based one in reducing wrong matches, therefore improving the reliability of infrared face recognition systems..
Chinese Optics Letters
- Publication Date: Jun. 16, 2011
- Vol. 9, Issue 8, 081002 (2011)
Integrated Optics
Novel photonic approach to microwave frequency measurement using tunable group delay line
Pengsheng Wu, Xiuyou Han, Yiying Gu, Shanfeng Li, Shu Hu, and Mingshan Zhao
A photonic approach for measuring microwave frequency over a wide bandwidth is proposed. An optic group delay line composed of several magneto-optical switches and a 1.6-km single-mode fiber is used as a tunable dispersive medium in the measurement setup. A minimum frequency accuracy of 80 MHz in the range of 1–20 GHz A photonic approach for measuring microwave frequency over a wide bandwidth is proposed. An optic group delay line composed of several magneto-optical switches and a 1.6-km single-mode fiber is used as a tunable dispersive medium in the measurement setup. A minimum frequency accuracy of 80 MHz in the range of 1–20 GHz is achieved experimentally..
Chinese Optics Letters
- Publication Date: Jun. 16, 2011
- Vol. 9, Issue 8, 081301 (2011)
Design and fabrication of polymeric multimode power splitter with secondary asymmetric branches
Shu Li, Qiao Lin, Liuhua Chen, and Xingkun Wu
A novel design of multimode light power splitter is proposed and fabricated by using secondary asymmetric Y branches. An almost equally divided output among output terminals is obtained experimentally. Maskless laser direct writing technique is applied in the fabrication process to facilitate the formation of power splA novel design of multimode light power splitter is proposed and fabricated by using secondary asymmetric Y branches. An almost equally divided output among output terminals is obtained experimentally. Maskless laser direct writing technique is applied in the fabrication process to facilitate the formation of power splitters by ultraviolet curable polymer. The analysis of the performances of both four-port and eight-port devices shows that these two dividers obtain a power splitting uniformity of more than 95%..
Chinese Optics Letters
- Publication Date: Jun. 16, 2011
- Vol. 9, Issue 8, 081302 (2011)
Scattering
Single-molecule surface-enhanced Raman scattering of R6G in aqueous environment under non-resonance conditions
Enzhong Tan, Penggang Yin, Lidong Li, and Lin Guo
The single-molecule surface-enhanced Raman scattering (SERS) spectra of Rhodamine 6G (R6G) in an aqueous environment under non-resonance conditions are studied. Series of spectra are recorded in timemapping mode, and intensity fluctuations of SERS signals and spectral diffusion are observed. The correlations between thThe single-molecule surface-enhanced Raman scattering (SERS) spectra of Rhodamine 6G (R6G) in an aqueous environment under non-resonance conditions are studied. Series of spectra are recorded in timemapping mode, and intensity fluctuations of SERS signals and spectral diffusion are observed. The correlations between the presence frequency of SERS spectra and number of hot spots as well as the quantity of molecules in scattering volume are examined thoroughly. The results indicate that only molecules located at hot spots produce good signal-to-noise ratio Raman spectra and the origin of fluctuating SERS signals are mainly ascribed to the movement of hot spots..
Chinese Optics Letters
- Publication Date: May. 31, 2011
- Vol. 9, Issue 8, 082901 (2011)
Spectroscopy
Optical absorption spectra of tourmaline crystals from Altay, China
Xueliang Liu, Xiqi Feng, Jianliang Fan, and Shouguo Guo
Tourmaline is an important functional and gem material. The current study examines pink, green, and brownish-green tourmalines from Altay deposit. Based on X-ray fluorescence (XRF) quantitative analyses and ultrariolet-visible-near-infrared (UV-VIS-NIR) spectral analyses in combination with annealing experiments, the cTourmaline is an important functional and gem material. The current study examines pink, green, and brownish-green tourmalines from Altay deposit. Based on X-ray fluorescence (XRF) quantitative analyses and ultrariolet-visible-near-infrared (UV-VIS-NIR) spectral analyses in combination with annealing experiments, the color center of tourmaline is found to be related to the d-d transitions of ions or the d-d transitions of exchange coupled ions. Annealing treatment affects the color improvement of tourmaline crystals..
Chinese Optics Letters
- Publication Date: Jun. 21, 2011
- Vol. 9, Issue 8, 083001 (2011)
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