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| 1 | 113-W in-phase mode output from two ytterbium-doped large-core double-cladding fiber lasers显示文摘Phase locking for two ytterbium-doped large-core fiber lasers has been demonstrated by using a self- imaging confocal resonator with a spatial filter.Steady high-contrast interference stripes are observed. The visibilities of coherent and incoherent stripes are 59% and 6%,respectively.The measured width of the central strip is in good agreement with the calculated result.For in-phase mode,the output power of the phase-locked fiber laser array is up to 113 W and corresponding slope efficiency is 38.5%. | 何兵 楼祺洪 周军 郑颖辉 薛冬 董景星 魏运荣 张芳沛 漆云凤 朱健强 李进延 李诗愈 王之江 | 2007 | Chinese Optics Letters2007，5，7： | 23 |
| 2 | Geometrically robust image watermarking using scale-invariant feature transform and Zernike moments显示文摘In order to resist geometric attacks,a robust image watermarking algorithm is proposed using scale- invariant feature transform(SIFT)and Zernike moments.As SIFT features are invariant to rotation and scaling,we employ SIFT to extract feature points.Then circular patches are generated using the most robust points.An invariant watermark is generated from each circular patch based on Zernike moments. The watermark is embedded into multiple patches for resisting locally cropping attacks.Experimental results show that the proposed scheme is robust to both geometric attacks and signal processing attacks. | 李雷达 郭宝龙 邵凯 | 2007 | Chinese Optics Letters2007，5，6： | 21 |
| 3 | Full distributed fiber optical sensor for intrusion detection in application to buried pipelines显示文摘Based on the microbend effect of optical fiber, a distributed sensor for real-time continuous monitoring of intrusion in application to buried pipelines is proposed. The sensing element is a long cable with a special structure made up of an elastic polymer wire, an optical fiber, and a metal wire. The damage point is located with an embedded optical time domain reflectometry (OTDR) instrument. The intrusion types can be indicated by the amplitude of output voltage. Experimental results show that the detection system can alarm adequately under abnormal load and can locate the intrusion point within 22.4 m for distance of 3.023 km. | 高建忠 蒋庄德 赵玉龙 朱笠 赵国仙 | 2005 | Chinese Optics Letters2005，3，11： | 20 |
| 4 | Temperature sensor based on PNR in Sagnac interferometer显示文摘A temperature sensor based on polarization non-reciprocity (PNR) in fiber-optic Sagnac interferometer (FSI) was proposed. The experimental study was made primarily and the results agree with theory well.Discussion shows that this kind of temperature sensor can achieve high precision and have great application potential. | 杨远洪 | 2004 | Chinese Optics Letters2004，2，5： | 20 |
| 5 | Measurement of large aspheric surfaces by annular subaperture stitching interferometry显示文摘A new method for testing aspheric surfaces by annular subaperture stitching interferometry is introduced. It can test large-aperture and large-relative-aperture aspheric surfaces at high resolution,low cost,and high efficiency without auxiliary null optics.The basic principle of the method is described,the synthetical optimization stitching model and effective algorithm are established based on simultaneous least-square fitting.A hyperboloid with an aperture of 350 mm is tested by this method.The obtained peak-to-valley (PV) and root-mean-square (RMS) values of the surface error after stitching are 0.433λand 0.052λ(λis 632.8 nm),respectively.The reconstructed surface map is coincide with the entire surface map from null test,and the difference of PV and RMS errors between them are 0.031λand 0.005λ,respectively. This stitching model provides another quantitive method for testing large aspheric surfaces besides null compensation. | 王孝坤 王丽辉 殷龙海 张斌智 范镝 张学军 | 2007 | Chinese Optics Letters2007，5，11： | 18 |
| 6 | Ultra-high-speed single red–green–blue light-emitting diode-based visible light communication system utilizing advanced modulation formats显示文摘We report a 3.75-Gb/s visible light communication(VLC) system thatusessingle-carrier frequency-domain equalization(SC-FDE) based on a single red–green–blue(RGB) light-emitting diode(LED),with the measured bit error rates(BERs) under a pre-forward-error-correction threshold of 3.8×10-3.The fundamental characteristics of an RGB-LED-based VLC system are measured.We also compare SC-FDE with OFDM in terms of peak-to-average power ratio and BER performance,which shows that SC-FDE outperforms the OFDM modulation scheme. | 迟楠 王源泉 王一光 黄星星 陆肖元 | 2014 | Chinese Optics Letters2014，12，1： | 18 |
| 7 | All fiber pulsed coherent lidar development for wind profiles measurements in boundary layers显示文摘An all fiber pulsed coherent Doppler lidar(CDL) system at 1.54 μm wavelength is developed for wind profiles measurements. This lidar affords 43.0-μJ pulse energy at 10-kHz pulse repetition frequency with500-ns pulse width. The lidar is operated in monostatic mode with 50-mm diameter telescope. The heterodyne mixing signals are acquired with 500 M/s analog to digital converter and 2048 points fast Fourier transform(FFT) is implemented. Line of sight wind speeds are measured with more than 3.0-km range in a horizontal direction and about 1.9 km in the vertical direction with 75-m range resolution.Systematic error of speed measurement of 0.2 m/s is validated. | 刁伟峰 张鑫 刘继桥 竹孝鹏 刘源 毕徳仓 陈卫标 | 2014 | Chinese Optics Letters2014，12，7： | 18 |
| 8 | Design and performance simulation of a molecular Doppler wind lidar显示文摘A mobile molecular Doppler wind lidar at an eye-safe wavelength of 355 nm based on double-edge technique is being built in Hefei (China) for wind measurement from 10-to 40-km altitude. The structure of this lidar system is described. A triple Fabry-Perot etalon is employed as a frequency discriminator whose parameters are optimized. The receiver system is designed to achieve compactness and stability by putting in a standard 19-inch socket bench. Simulation results show that within the wind speed dynamic range of ±100 m/s, the horizontal wind errors due to noise are less than 1 m/s below 20-km altitude for 100-m vertical resolution, and less than 5.5 m/s from 20 km up to 40 km for 500-m vertical resolution with 400-mJ laser energy, 30-min temporal resolution, and a 45-cm aperture telescope. | 沈法华 Hyunki Cha 董吉辉 Dukhyeon Kim 孙东松 Sung Ok Kwon | 2009 | Chinese Optics Letters2009，7，7： | 17 |
| 9 | Spectral characterization of scanner based on PCA and BP ANN显示文摘A novel method for spectral characterization of scanner was proposed in this paper, which combined the principal component analysis (PCA) and back propagation (BP) artificial neural network (ANN). | 王勇 徐海松 | 2005 | Chinese Optics Letters2005，3，12： | 16 |
| 10 | Recognizing cat-eye targets with dual criterions of shape and modulation frequency显示文摘We present an image recognition method to distinguish targets with cat-eye effect from the dynamic background based on target shape and modulation frequency.Original image sequences to be processed are acquired through an imaging mechanism that utilizes a pulsed laser as active illuminator and an industrial camera as detection device.There are two criterions to recognize a target: one exploits shape priors and the other is the active illuminator’s modulation frequency.The feasibility of the proposed method and its superiority over the single criterion method have been demonstrated by practical experiments. | 任熙明 李丽 | 2011 | Chinese Optics Letters2011，9，4： | 16 |
| 11 | Quantum efficiency calibration of opto-electronic detector by means of correlated photons method显示文摘A new calibration method of detectors can be realized by using correlated photons generated in spontaneous parametric down-conversion (SPDC) effect of nonlinear crystal.An absolute calibration system of detector quantum efficiency is performed.And its principle and experimental setup are introduced.A continuous- wave (CW) ultraviolet (351 nm),diode-pumped,frequency-doubled,and solid-state laser is used to pump BBO crystal.The quantum efficiencies of the photomultiplier at 633,702,and 789 nm are measured respectively.The coincidence peaks are observed using coincidence circuit.Some measurement factors including the filter bandwidth of trigger channel,the detector position alignment and polarization of the pump light are analyzed.The uncertainties of this calibration method are also analyzed,and the relative uncertainties of total calibration are less than 5.8%.The accuracy of this method could be improved in the future. | 李健军 郑小兵 卢云君 邹鹏 张伟 | 2008 | Chinese Optics Letters2008，6，7： | 16 |
| 12 | A high sensitive fiber Bragg grating strain sensor with automatic temperature compensation显示文摘A high sensitive fiber Bragg grating(FBG) strain sensor with automatic temperature compensation is demonstrated.FBG is axially linked with a stick and their free ends are fixed to the measured object.When the measured strain changes,the stick does not change in length,but the FBG does.When the temperature changes,the stick changes in length to pull the FBG to realize temperature compensation.In experiments,1.45 times strain sensitivity of bare FBG with temperature compensation of less than 0.1 nm Bragg wavelength drift over 100 °C shift is achieved. | 李阔 周振安 | 2009 | Chinese Optics Letters2009，7，3： | 16 |
| 13 | Space optical remote sensor image motion velocity vector computational modeling, error budget and synthesis显示文摘For space optical remote sensor (SORS) with either film or time delay and integrate charge coupled device (TDI-CCD) imaging, in order to achieve higher resolution it requires more accurate real-time image motion compensation. This primarily depends on real-time computation of the image motion velocity vector (IMVV) and error budget and synthesis on related parameters. An effective modeling scheme is introduced and the derivation of IMVV equation, error budget and synthesis by Monte-Carlo method are presented in detail. This total solution was applied to SORS system test on orbit and has been confirmed to be very accurate based on the resolution, transfer function at Nyquist frequency, signal-to-noise ratio and average gray scale of the captured images. | 王家骐 于平 颜昌翔 任建岳 何斌 | 2005 | Chinese Optics Letters2005，3，7： | 15 |
| 14 | Study on optical wave scattering from slightly Gaussian rough surface of layered medium显示文摘The optical wave scattering from the slightly rough surface of three-layer medium is studied.The formulaes of the scattering coefficients for different polarizations are derived using the small perturbation method. A Gaussian rough surface is presented for describing rough surface of layered medium,the influence of the permittivity of layered medium,the mean layer thickness of intermediate medium,the surface roughness parameters and the incident wavelength on the bistatic scattering coefficient of HH polarization are obtained and discussed by numerical implementation. | 任新成 郭立新 | 2007 | Chinese Optics Letters2007，5，10： | 15 |
| 15 | 2D noncarbon materials-based nonlinear optical devices for ultrafast photonics [Invited]显示文摘Ultrafast lasers play an important role in a variety of applications ranging from optical communications to medical diagnostics and industrial materials processing. Graphene and other two-dimensional(2D) noncarbon materials, including topological insulators(TIs), transition metal dichalcogenides(TMDCs), phosphorene, bismuthene, and antimonene, have witnessed a very fast development of both fundamental and practical aspects in ultrafast photonics since 2009. Their unique nonlinear optical properties enable them to be used as excellent saturable absorbers(SAs) that have fast responses and broadband operation, and can be easily integrated into lasers. Here, we catalog and review recent progress in the exploitation of these 2D noncarbon materials in this emerging field. The fabrication techniques, nonlinear optical properties, and device integration strategies of 2D noncarbon materials are first introduced with a comprehensive view. Then, various mode-locked/Q-switched lasers(e.g., fiber, solid-state, disk, and waveguide lasers) based on 2D noncarbon materials are reviewed. In addition, versatile soliton pulses generated from the mode-locked fiber lasers based on 2D noncarbon materials are also summarized. Finally, future challenges and perspectives of 2D materials-based lasers are addressed. | 郭波 | 2018 | Chinese Optics Letters2018，16，2： | 14 |
| 16 | Measurement of optical penetration depth and refractive index of human tissue显示文摘Experimental techniques for measurement of optical penetration depth and refractive index of human tissue are presented, respectively. Optical penetration depth can be obtained from the measurement of the relative fluence-depth distribution inside the target tissue. The depth of normal and carcinomatous human lung tissues irradiated with the wavelengths of 406.7, 632.8 and 674.4 nm in vitro are respectively determined. In addition, a novel simple method based on total internal reflection for measuring the refractive index of biotissue in vivo is developed, and the refractive indices of skin from people of different age, sex and skin color are measured. Their refractive indices are almost same and the average is 1.533. | 谢树森 李晖 李步洪 | 2003 | Chinese Optics Letters2003，1，1： | 14 |
| 17 | A new adaptive nonuniformity correction algorithm for infrared line scanner based on neural networks显示文摘The striping pattern nonuniformity of the infrared line scanner (IRLS) severely limits the system performance. An adaptive nonuniformity correction (NUC) algorithm for IRLS using neural network is proposed. It uses a one-dimensional median filter to generate ideal output of network and can complete NUC by a single frame with a high correction level. Applications to both simulated and real infrared images show that the algorithm can obtain a satisfactory result with low complexity, no need of scene diversity or global motion between consecutive frames. It has the potential to realize real-time hardware-based applications. | 隋婧 董立泉 金伟其 张雅元 | 2007 | Chinese Optics Letters2007，5，2： | 14 |
| 18 | Modified adaptive algebraic tomographic reconstruction of gas distribution from incomplete projection by a two-wavelength absorption scheme显示文摘A modified adaptive algebraic reconstruction technique (MAART) with an auto-adjustment relaxation parameter and smoothness regularization is developed to reveal the tomographic reconstruction of H 2 O distribution in combustion from incomplete projections. Determinations of relaxation parameter and regularization factor are discussed with regard to the consideration of improvement in reconstruction and reduction of computational burden. A two-wavelength scheme from tunable diode laser absorption measurement, 7444.36 and 7185.59 cm 1 , is used to simplify the nonlinear solution problem for obtaining the tomographic distributions of concentration and temperature simultaneously. Results of calculations demonstrate that MAART can perform the reconstruction results more efficiently with little complex modification and much lower iterations as compared with the traditional algebraic reconstruction technique (ART) or simultaneous iterative reconstruction technique (SIRT) methods. The stability of the algorithm is studied by reconstruction from projections with random noise at different levels to demonstrate the dependence of reconstruction results on precise line-of-sight measurements. | 李宁 翁春生 | 2011 | Chinese Optics Letters2011，9，6： | 14 |
| 19 | Angle-tuned signal-resonated optical parametric oscillator based on periodically poled lithium niobate显示文摘We demonstrate an angle-tuned signal-resonated optical parametric oscillator (OPO) with periodically poled lithium niobate (PPLN) pumped by a diode-pumped Nd:YVO4 laser. 1499.8 - 1506.6 nm of signal wavelength is achieved at 140°C by rotating a 29-μm period PPLN from 0° - 10.22° in the x-y plane while keeping the pump wave vertical to the resonator mirrors. Two pairs of the signal and idler waves of the same wavelengths can be achieved symmetrically for each pair of angles of rotation with same absolute value and opposite sign. Theoretical analyses on angle-tuned PPLN-OPO with pump wave vertical to the resonator mirrors are presented and in good agreement with our experimental results. It is also found that all interacting waves in the cavity (not inside the crystal) are always collinear for PPLN-OPO with the pump wave vertical to the resonator mirrors while phase-matching is noncollinear within the crystal. | 张百钢 姚建铨 张浩 徐德刚 王鹏 李学金 丁欣 | 2003 | Chinese Optics Letters2003，1，6： | 13 |
| 20 | Determining particle size distribution and refractive index in a two-layer tissue phantom by linearly polarized light显示文摘We report a new method for measuring particle size distribution (PSD) and refractive index of the top layer in a two-layer tissue phantom simulated epithelium tissue by varying the azimuth angle of incident linearly polarized light. The polarization gating technique is used to decouple the single and multiple scattering components in the returned signal. The theoretical model based on Mie theory is presented and a nonlinear inversion method - floating genetic algorithm - is applied to inverting the azimuth dependence of component of polarization light backscattered. The experiment results demonstrate that the size distribution and refractive index of the scatters of the top layer can be determined by measuring and analyzing the differential signal of the parallel and perpendicular components from a two-layer tissue phantom. The method implies to detect precancerous changes in human epithelial tissue. | 邓勇 鲁强 骆清铭 | 2006 | Chinese Optics Letters2006，4，1： | 13 |
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