Author Affiliations
Abstract
1 State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China
2 School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
3 Aston Institute of Photonic Technologies (AiPT), Aston University, Birmingham B4 7ET, UK
4 e-mail: yanzhijin@gmail.com
5 e-mail: l.zhang@aston.ac.uk
We demonstrate a stable conventional soliton in a Tm-doped hybrid mode-locked fiber laser by employing a homemade all-fiber Lyot filter (AFLF) and a single-wall carbon nanotube. The AFLF, designed by sandwiching a piece of polarization-maintained fiber (PMF) with two 45° tilted fiber gratings inscribed by a UV laser in PMF with a phase-mask scanning technique, shows large filter depth of ～9 dB and small insertion loss of ～0.8 dB. By optimizing the free spectral range of the AFLF, the Kelly sidebands of a conventional soliton centered at 1966.4 nm can be dramatically suppressed without impairing the main shape of the soliton spectrum. It gives the pulse duration of 1.18 ps and bandwidth of 3.8 nm. By adjusting the temperature of the PMF of the AFLF from 7°C to 60°C, wavelength tunable soliton pulses ranging from 1971.62 nm to 1952.63 nm are also obtained. The generated soliton pulses can be precisely tuned between 1971.62 nm and 1952.63 nm by controlling the temperature of the AFLF.
Photonics Research
2019, 7(2): 02000103
1 中国科学院长春光学精密机械与物理研究所, 吉林 长春 130033
2 中国科学院大学, 北京 100049
为了提高光电编码器速度检测精度，设计了一种基于叠栅条纹光电信号的编码器测速方法。结合全微分方程，建立叠栅条纹光电信号测速模型。分析了影响编码器测速精度的主要因素，并对比不同误差对测速精度的影响。结合测速模型设计改进算法，并完成系统实现。实验结果表明：对某21位光电编码器进行测速实验，将测速误差均方根由0.0367 rad/s降低到0.0216 rad/s。此方法测量速度快，测速精度高，适合实时性要求较高的控制场合。
测量 光电轴角编码器 光电叠栅条纹 高精度测速 中国激光
2015, 42(11): 1108003
Author Affiliations
Abstract
We propose an integral imaging system that uses three lens arrays, including two convex lens arrays and a concave lens array. Compared with the conventional integral imaging system, the proposed system can remarkably enhance the viewing angle. The maximum viewing angle can be enlarged to 48o, which is 4.8 times wider than that of the conventional system. The principle of the proposed system is elucidated, and the experimental results are presented in this letter.
110.6880 Three-dimensional image acquisition 080.2740 Geometric optical design 120.4640 Optical instruments Chinese Optics Letters
2014, 12(1): 011101
Author Affiliations
Abstract
A crosstalk-free integral imaging display consisting of a display panel and double plano-convex micro-lens array is proposed. The double plano-convex micro-lens array includes two micro-lens arrays, A and B. Micro-lens array A is used to eliminate crosstalk by completely reflecting crosstalk lights. Micro-lens array B, located near micro-lens array A, is used to display three-dimensional images. Computer simulations based on ray-tracing are conducted. Crosstalk-free reconstruction images may be clearly observed from the simulation results.
110.6880 Three-dimensional image acquisition 100.6890 Three-dimensional image processing 110.2990 Image formation theory Chinese Optics Letters
2013, 11(6): 061101
