Journals >Chinese Optics Letters
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2016
Volume: 14 Issue 11
24 Article(s)
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Atomic and Molecular Physics
Control of molecular excitation during the plasma generation of a femtosecond laser pulse
Quanjun Wang, Yanghua Zhang, Zhenhao Wang, Jingjie Ding, Zuoye Liu, and Bitao Hu
From a classical dynamic simulation, we find the kinetic energy of the electrons generated during laser plasma generation depends on the laser polarization and intensity. The electron kinetic energy reaches its maximum with a fixed laser intensity for circularly polarized laser pulse. The fluorescence spectra at 380.4 From a classical dynamic simulation, we find the kinetic energy of the electrons generated during laser plasma generation depends on the laser polarization and intensity. The electron kinetic energy reaches its maximum with a fixed laser intensity for circularly polarized laser pulse. The fluorescence spectra at 380.4 nm from N 2 N 2 +
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 110201 (2016)
Fourier Optics and Signal Processing
Compact optoelectronic oscillator based on a Fabry–Perot resonant electro-optic modulator
Jian Dai, Yitang Dai, Feifei Yin, Yue Zhou, Jianqiang Li, Yuting Fan, and Kun Xu
A novel compact optoelectronic oscillator (OEO) employing a Fabry–Perot (FP) resonant electro-optic (EO) modulator is proposed and experimentally demonstrated. The resonant modulator is used as the optical storage element as well as the mode selection element, which can greatly reduce the system complexity and make theA novel compact optoelectronic oscillator (OEO) employing a Fabry–Perot (FP) resonant electro-optic (EO) modulator is proposed and experimentally demonstrated. The resonant modulator is used as the optical storage element as well as the mode selection element, which can greatly reduce the system complexity and make the system more portable. Moreover, the optical resonance and electrical transmission response for the FP resonant EO modulator are theoretically and experimentally studied. The proposed OEO oscillates at 10 and 20 GHz in the proof-of-concept experiment, and the corresponding single-sideband phase noise can reach below 118 108 dBc / Hz
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 110701 (2016)
Instrumentation, Measurement, and Metrology
Simultaneous measurement of gas distribution in a premixed flame using adaptive algebraic reconstruction technique based on the absorption spectrum
Lifang Zhang, Fei Wang, Haidan Zhang, Jianhua Yan, and Kefa Cen
Four tomography algorithms, including the algebraic reconstruction technique, simultaneous iterative reconstruction technique, the multiplicative algebraic reconstruction technique, and the adaptive algebraic reconstruction technique (AART), are compared with each other based on the tunable diode laser absorption spectFour tomography algorithms, including the algebraic reconstruction technique, simultaneous iterative reconstruction technique, the multiplicative algebraic reconstruction technique, and the adaptive algebraic reconstruction technique (AART), are compared with each other based on the tunable diode laser absorption spectroscopy technique; the determination of the relaxation parameter is discussed to improve reconstruction quality and shorten computational time as much as possible. The calculated results demonstrate that the AART algorithm can produce the reconstruction results with better quality and less computational time. In the experimental measurement, the AART algorithm with a two-line thermometry scheme is adopted to measure the spatial distribution of H 2 O H 2 O H 2 O
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 111201 (2016)
Lasers and Laser Optics
1.88 μm, Ba(NO3)2-based Raman laser pumped by a potassium-titanyl-phosphate-based optical parametric oscillator laser
Junchi Chen, Xiao Zou, Yujie Peng, Hongpeng Su, and Yuxin Leng
A 1.88 μm Ba(NO3)2-based stimulated Raman scattering (SRS) laser pumped by a potassium-titanyl-phosphate-based optical parametric oscillator (OPO) laser is presented. Under the pumping energy of a 130 mJ 1064 nm Q-switched Nd:YAG laser, a 40 mJ 1.57 μm laser is achieved; the maximum output energy of the 1.88 μm Raman lA 1.88 μm Ba ( NO 3 ) 2 Q
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 111401 (2016)
Low threshold high stability passively mode-locked laser performance of a disordered crystal: Nd3+:Gd0.5Y2.5Al5O12
Chao Feng, Zhaojun Liu, Zhenhua Cong, Xiaodong Xu, Jun Xu, Han Rao, Fen Bai, Ping Li, 青圃 王, and Jiaxiong Fang
A stable passively mode-locked laser of Nd3+:Gd0.5Y2.5Al5O12 (Nd:GYAG) disordered crystal is experimentally investigated both using Z-type and W-type cavities with a semiconductor saturable absorbed mirror. The continuous-wave mode-locked threshold of the absorbed pump power is just 1.8 W. The maximum average output poA stable passively mode-locked laser of Nd 3 + : Gd 0.5 Y 2.5 Al 5 O 12
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 111402 (2016)
Three-dimensional catadioptric vision sensor using omnidirectional dot matrix projection
Fuqiang Zhou, Xin Chen, Haishu Tan, and Xinghua Chai
In order to solve the problem of low measurement accuracy caused by uneven imaging resolutions, we develop a three-dimensional catadioptric vision sensor using 20 to 100 lasers arranged in a circular array called omnidirectional dot maxtric projection (ODMP). Based on the imaging characteristic of the sensor, the ODMP In order to solve the problem of low measurement accuracy caused by uneven imaging resolutions, we develop a three-dimensional catadioptric vision sensor using 20 to 100 lasers arranged in a circular array called omnidirectional dot maxtric projection (ODMP). Based on the imaging characteristic of the sensor, the ODMP can image the area with a high image resolution. The proposed sensor with ODMP can minimize the loss of the detail information by adjusting the projection density. In evaluating the performance of the sensor, real experiments show the designed sensor has high efficiency and high precision for the measurement of the inner surfaces of pipelines..
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 111403 (2016)
Diffraction and Gratings
Experimental demonstration of twisted light’s diffraction theory based on digital spiral imaging
Wuhong Zhang, Ziwen Wu, Jikang Wang, and Lixiang Chen
We present both numerical and experimental results to study the diffraction of twisted light beams based on orbital angular momentum (OAM) eigenmode decomposition, where the total initial field, including light and aperture, is represented by a two-dimensional spectrum of Laguerre–Gaussian modes. We use a phase-only spWe present both numerical and experimental results to study the diffraction of twisted light beams based on orbital angular momentum (OAM) eigenmode decomposition, where the total initial field, including light and aperture, is represented by a two-dimensional spectrum of Laguerre–Gaussian modes. We use a phase-only spatial light modulator to display a holographic grating for both generating the twisted light and mimicking the finite aperture. We take a triangular aperture as an example to describe the diffraction behavior of a twisted light beam carrying an OAM number of = 3
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 110501 (2016)
Optical Devices
Multi-color-emitting quantum dot-based white LEDs
Xiaoqin Gao, Jian Dang, Liang Wu, Bin Sheng, Jiayu Zhang, and Zaichen Zhang
Research on white light-emitting diodes (LEDs) based on multi-color-emitting quantum dots (QDs) is carried out in this Letter. The equations of luminous efficiency (LE), color rendering index (CRI), chromaticity coordinates (x,y), and color temperature (Tc) of white LEDs are obtained, according to the spectral-LE functResearch on white light-emitting diodes (LEDs) based on multi-color-emitting quantum dots (QDs) is carried out in this Letter. The equations of luminous efficiency (LE), color rendering index (CRI), chromaticity coordinates ( x , y ) T c Φ
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 112301 (2016)
Tunable, ultra-narrow-band optical filter based on a whispering gallery mode hybrid-microsphere
Hongdan Wan, Hongye Li, Haohan Zhu, Ji Xu, Yunqing Lu, and Jin Wang
We demonstrate an ultra-narrow-band optical filter based on a hybrid-microsphere consisting of a coated SiO2 microsphere. As compared to the SiO2 microsphere, the hybrid-microsphere produces a quality factor of >108, a transmission spectrum bandwidth of <1 pm, and an increased side-mode suppression ratio. The micWe demonstrate an ultra-narrow-band optical filter based on a hybrid-microsphere consisting of a coated SiO 2 SiO 2 > 10 8 < 1 pm SiO 2
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 112302 (2016)
Slim OFRS based on a grating input coupler and a microprism sensing surface
Ping Ma, Xuecheng Cui, Jun Zheng, Pinchun Kang, and 志成 叶
A slim optical fingerprint recognition sensor (OFRS) based on a grating input coupler and a microprism sensing surface is proposed. By using a subwavelength grating coupler, input light is coupled into the planar waveguide and the propagation angle is well engineered to avoid image overlap, thus an undistorted fingerprA slim optical fingerprint recognition sensor (OFRS) based on a grating input coupler and a microprism sensing surface is proposed. By using a subwavelength grating coupler, input light is coupled into the planar waveguide and the propagation angle is well engineered to avoid image overlap, thus an undistorted fingerprint is captured. For maintaining a thin structure, a microprism array is utilized to facilitate the breaking of total internal reflection under a large diffraction angle from the grating. The feasibility, efficiency, and image quality of the proposed structure are verified and discussed. The device has the advantages of a slim structure, a high image contrast, and a compact architecture, suitable for mobile devices..
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 112303 (2016)
Fiber Optics and Optical Communications
Decision-free radius-directed Kalman filter for universal polarization demultiplexing of square M-QAM and hybrid QAM signals
Yanfu Yang, Qun Zhang, Yong Yao, Guoliang Cao, Kangping Zhong, Xian Zhou, Alan Pak Tao Lau, and Chao Lu
We propose and experimentally demonstrate a universal and blind polarization-state tracking scheme for M-quadrature amplitude modulation (QAM) signals based on a decision-free radius-directed linear Kalman filter (RD-LKF). The polarization tracking performance is investigated through simulation and experiments for bothWe propose and experimentally demonstrate a universal and blind polarization-state tracking scheme for M-quadrature amplitude modulation (QAM) signals based on a decision-free radius-directed linear Kalman filter (RD-LKF). The polarization tracking performance is investigated through simulation and experiments for both quadrature phase-shift keying (QPSK) and 16-QAM signals. The influence of the filter parameters on the static polarization demultiplexing performance and dynamic tracking capability are discussed via simulation. The optimization strategy of the filter parameters in modulation-format-independent scenarios is proposed and simulations are carried out to evaluate the polarization demultiplexing penalty for QPSK, 16QAM, and hybrid QPSK/16QAM signals. Finally, the proposed decision-free RD-LKF is experimentally compared to the respective algorithms of constant modulus algorithm and multimodulus algorithm for QPSK and 16-QAM and the advantage of ultrafast polarization tracking ability is confirmed..
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 110601 (2016)
High order modulation format identification based on compressed sensing in optical fiber communication system
Bingxiang Hui, Xianfeng Tang, Na Gao, Wenbo Zhang, and Xiaoguang Zhang
We propose a method of modulation format identification based on compressed sensing using a high-order cyclic cumulant combined with a binary tree classifier. Through computing the fourth-order cyclic cumulant of the pretreated band signal, which is obtained by compressed sensing with the sampling rate much less than tWe propose a method of modulation format identification based on compressed sensing using a high-order cyclic cumulant combined with a binary tree classifier. Through computing the fourth-order cyclic cumulant of the pretreated band signal, which is obtained by compressed sensing with the sampling rate much less than the Nyquist sampling value, the feature vector for classification is extracted. Simulations are carried out in the optical coherent fiber communication system with different modulation formats of multiple phase-shift keying and multiple quadrature amplitude modulation. The results indicate that this method can identify these modulation formats correctly and efficiently. Meanwhile, the proposed method is insensitive to laser phase noise and signal noise..
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 110602 (2016)
High sensitivity side-hole fiber magnetic field sensor based on surface plasmon resonance
Sijun Weng, Li Pei, Jianshuai Wang, Tigang Ning, and Jing Li
A high sensitivity magnetic fluid (MF) filled side-hole fiber magnetic field sensor based on surface plasmon resonance (SPR) is designed and investigated. Within the side-hole fiber, the water-based MF is injected into the two side holes, and both of the holes are coated with gold to realize the measurement of the magnA high sensitivity magnetic fluid (MF) filled side-hole fiber magnetic field sensor based on surface plasmon resonance (SPR) is designed and investigated. Within the side-hole fiber, the water-based MF is injected into the two side holes, and both of the holes are coated with gold to realize the measurement of the magnetic field by using the SPR effect. The refractive index of the MF changes with different external magnetic fields, resulting in the resonant wavelength moving to other wavelengths. Furthermore, when the external magnetic field increases from 30 to 210.9 Oe, the magnetic field sensitivity can reach to 1.063 nm/Oe..
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 110603 (2016)
Experimental demonstration of an adaptive orthogonal frequency division multiplexing visible light communication system
Xinyue Guo, and Xin Li
We propose and experimentally demonstrate a simple visible light communication system by combining an adaptive transmission technique with orthogonal frequency division multiplexing. In the adaptive transmission scheme, power allocation is performed in such a way as to maximize the channel capacity under electric powerWe propose and experimentally demonstrate a simple visible light communication system by combining an adaptive transmission technique with orthogonal frequency division multiplexing. In the adaptive transmission scheme, power allocation is performed in such a way as to maximize the channel capacity under electric power constraints, and adaptive modulation is then introduced to achieve the maximum data rate given a target bit error rate. Experimental results show that spectrum efficiency can be greatly improved through this adaptive transmission technique..
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 110604 (2016)
High performance fiber optic gyroscope with a radiation-tolerant and temperature-stable scale factor
Yuanhong Yang, and Fuling Yang
A simple wavelength-independent scale factor model is established for a closed-loop interferometer fiber optic gyroscope (IFOG) and a method to keep the scale factor radiation tolerant and temperature stable in a high performance IFOG for space application is proposed. The half-wave voltage (Vπ) of the multifunction gyA simple wavelength-independent scale factor model is established for a closed-loop interferometer fiber optic gyroscope (IFOG) and a method to keep the scale factor radiation tolerant and temperature stable in a high performance IFOG for space application is proposed. The half-wave voltage (V π Co 60 40 °C + 60 °C
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 110605 (2016)
Circularly polarizing fibers with a triple-lobe stress region
Yueyu Xiao, Jinkui Yan, Lei Peng, and Mingjue Tang
A fiber structure with a circularly polarizing property is proposed. The fiber consists of a round core and a triple-lobe stress region in the cladding, which is compatible with single-mode fibers, and it can be fabricated using conventional metal chemical vapor deposition processes. By coating a layer with a high-refrA fiber structure with a circularly polarizing property is proposed. The fiber consists of a round core and a triple-lobe stress region in the cladding, which is compatible with single-mode fibers, and it can be fabricated using conventional metal chemical vapor deposition processes. By coating a layer with a high-refractive index, the twist pitch required for resonant coupling is increased to hundreds of micrometers, and the mature pit-in-jacket drawing technique can be used. The polarization filtering properties of the fabricated circularly polarizing fibers are measured experimentally, showing high distinction ratios in a broad frequency region..
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 110606 (2016)
Free-space optical communication using patterned modulation and bucket detection
Tianyi Mao, Qian Chen, Weiji He, Yunhao Zou, Huidong Dai, and Guohua Gu
In this Letter, free-space optical (FSO) communication using patterned modulation and bucket detection is introduced to improve the bit error rate (BER) performance in complex and noisy environments. The scattered light is averaged in this communication structure. Second-order correlation, wavelet normalization, and coIn this Letter, free-space optical (FSO) communication using patterned modulation and bucket detection is introduced to improve the bit error rate (BER) performance in complex and noisy environments. The scattered light is averaged in this communication structure. Second-order correlation, wavelet normalization, and compressed sensing are combined in the reconstruction algorithm. A signal with N N
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 110607 (2016)
Inter-satellite range-finding method with high precision and large range based on optoelectronic resonance
Bin Chen, Jinlong Yu, Ju Wang, Tianyu Li, Wenrui Wang, Yang Yu, and Tianyuan Xie
As microsatellite technology develops, precise inter-satellite measurement shows its significance in distributed satellite systems. In this Letter, a novel technique is proposed for measuring the inter-satellite distance, which adopts optoelectronic resonance and has a function of self-referencing. Resonance cavities hAs microsatellite technology develops, precise inter-satellite measurement shows its significance in distributed satellite systems. In this Letter, a novel technique is proposed for measuring the inter-satellite distance, which adopts optoelectronic resonance and has a function of self-referencing. Resonance cavities have a high spectral purity and a high oscillation frequency. By utilizing the accumulative amplification principle to convert the measurement of distance to that of the frequency, high accuracy is achieved. In the experiment, this measuring scheme has a large measuring range between 1 and 6 km (can be potentially larger), and the accuracy is better than 1.5 μm. The relative accuracy reaches the level of 10 10
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 110608 (2016)
Imaging Systems
Three-dimensional imaging lidar system based on high speed pseudorandom modulation and photon counting
Yufei Zhang, Yan He, Fang Yang, Yuan Luo, and Weibiao Chen
High speed pseudorandom modulation and photon counting techniques are applied to a three-dimensional imaging lidar system. The specific structure and working principle of the lidar system is described. The actual detector efficiency of a single-photon detector in an imaging system is discussed, and the result shows thaHigh speed pseudorandom modulation and photon counting techniques are applied to a three-dimensional imaging lidar system. The specific structure and working principle of the lidar system is described. The actual detector efficiency of a single-photon detector in an imaging system is discussed, and the result shows that a variety of reasons lead to the decrease in detection efficiency. A series of ranging and imaging experiments are conducted, and a series of high-resolution three-dimensional images and a distance value of 1200 m of noncooperative targets are acquired..
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 111101 (2016)
3D imaging by two-color Ewald spheres with optical lasers
Jian Zhang, Jiadong Fan, Jianhua Zhang, Qingjie Huang, and Huaidong Jiang
3D imaging techniques such as computed tomography, ultrasonography, and magnetic resonance imaging usually combine many scans computationally. Here, we report a 3D imaging approach using an optical-laser diffraction microscope with two different wavelength lasers in the same orientation. A double-layered sample constru3D imaging techniques such as computed tomography, ultrasonography, and magnetic resonance imaging usually combine many scans computationally. Here, we report a 3D imaging approach using an optical-laser diffraction microscope with two different wavelength lasers in the same orientation. A double-layered sample constructed of silica spheres is used for coherent diffraction imaging with two lasers at 543 and 432 nm. The diffraction patterns obtained using a planar detector at a high numerical aperture are projected onto the Ewald spheres. 3D images of the double-layered sample are successfully reconstructed from the two-color spherical diffraction patterns..
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 111102 (2016)
Coprime-frequencied sinusoidal modulation for improving the speed of computational ghost imaging with a spatial light modulator
Quan Li, Zhentao Duan, Huizu Lin, Shaobo Gao, Shuai Sun, and Weitao Liu
Correlation imaging is attracting more and more attention as a novel imaging technique taking advantage of the high-order coherence of light fields. To reconstruct an image of the object, many frames of different speckle patterns are required. Therefore, the speed of imaging is strongly limited by the speed of the refrCorrelation imaging is attracting more and more attention as a novel imaging technique taking advantage of the high-order coherence of light fields. To reconstruct an image of the object, many frames of different speckle patterns are required. Therefore, the speed of imaging is strongly limited by the speed of the refreshing rate of the light field. We propose a coprime-frequencied sinusoidal modulation method for speckle pattern creation using a spatial light modulator in a computational ghost imaging system to increase the speed of imaging. The performance of the proposed method is discussed as well..
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 111103 (2016)
Materials
Temperature-dependent optical response of phase-only nematic liquid crystal on silicon devices
Zichen Zhang, Huan Xu, Haining Yang, Zheng You, and D. P. Chu
Wavelength-dependent birefringence and dielectric anisotropy, two major optical properties of the nematic liquid crystal materials used in phase-only liquid crystal on silicon (LCOS) devices, are measured as a function of operating temperatures. The dynamic phase modulation depth and threshold voltage of these phase-onWavelength-dependent birefringence and dielectric anisotropy, two major optical properties of the nematic liquid crystal materials used in phase-only liquid crystal on silicon (LCOS) devices, are measured as a function of operating temperatures. The dynamic phase modulation depth and threshold voltage of these phase-only LCOS devices are also measured in the corresponding temperature range and compared with theoretical predictions. The results show that the dynamic response time can be reduced significantly by an appropriate increase of device operative temperature, while the necessary device elements, such as phase modulation depth and threshold voltage, can be maintained at the same time..
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 111601 (2016)
Thin Films
Regulation of the magnetic behavior by adjusting oxygen stoichiometry in ZrOx film
Huanfeng Zhu, Jing Li, Kun Chen, Xinyu Yi, Shuai Cheng, Yafei Yuan, and Fuxi Gan
The mechanism of ferromagnetic ordering in ZrOx film is investigated by both experimental observation and theoretical calculation. Magnetic measurements reveal that the magnetic properties can be adjusted from diamagnetism to ferromagnetism by varying the oxygen stoichiometry. We find that oxygen-rich defects can be reThe mechanism of ferromagnetic ordering in ZrO x
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 113101 (2016)
Scattering
Research on the fractal model and calibration of the aerosol mass concentration measurement based on the particle group light scattering
Fang Gu, Yi Liu, Jiahong Zhang, Yunyun Chen, and Fengping Cui
In order to improve the inversion precision of aerosol mass concentrations based on the particle group light scattering method, the concept that particles through a laser beam are equivalent to an aggregate is proposed. A fractal model for aerosol mass concentration using the signal amplitude distribution of aggregatesIn order to improve the inversion precision of aerosol mass concentrations based on the particle group light scattering method, the concept that particles through a laser beam are equivalent to an aggregate is proposed. A fractal model for aerosol mass concentration using the signal amplitude distribution of aggregates is presented, and then the subsection calibration method is given. The experimental results show that the mass concentrations inversed by this model agree well with those measured by the norm-referenced instrument. The average relative errors of the two experiments are 5.6% and 6.0%, respectively, which are less than those obtained by the conventional inversion model..
Chinese Optics Letters
- Publication Date: Nov. 10, 2016
- Vol. 14, Issue 11, 112901 (2016)
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