Author Affiliations
Abstract
1 National Laboratory on High Power Laser and Physics, Shanghai 201800, China
2 Key Laboratory of High Power Laser and Physics, Shanghai Institute of Optics and fine Mechanics, Chinese Academy of Science, Shanghai 201800, China
3 University of Chinese Academy of Sciences, Beijing 100049, China
A fiber-based，high precision long-term stable time synchronization system for multi-channel laser pulses is presented，using fiber pulse stacker combined with high-speed optical-electrical conversion and electronics processing technology. This scheme is used to synchronize two individual lasers including a mode-lock laser and a time shaping pulse laser system. The relative timing jitter between two laser pulses achieved with this system is 970 fs (rms) in five minutes and 3.5 ps (rms) in five hours. The synchronization system is low cost and can work at over several tens of MHz repetition rate.
ICF OPCPA time synchronization long-term stable Collection Of theses on high power laser and plasma physics
2016, 14(1): 10019
Author Affiliations
Abstract
1 中国科学院上海光学精密机械研究所高功率物理联合实验室, 上海 201800
2 中国科学院大学, 北京 100049
A method of controlling spectrum based on all-fiber multi-pass phase modulation is demonstrated experimentally and theoretically. Numerical simulation results indicate that modulation times, modulation depth, shape and width of the modulation signal and synchronized precision between optical pulse and modulation signal have influences on the central wavelength, bandwidth as well as the shape of the output spectrum. The input spectrum with bandwidth of 0.03 nm is broadened into 2.238 nm after multi-pass phase modulation, and the experimental results match well with the simulation results. The corresponding relationship between the modulation signal waveforms with different phases and the output spectra is obtained, and the feasibility of the spectral characteristics control is verified.
光纤光学 啁啾脉冲放大 光谱控制 相位调制 fiber optics chirped pulse amplification spectrum control phase modulation Collection Of theses on high power laser and plasma physics
2016, 14(1): 0801004
1 中国科学院上海光学精密机械研究所高功率物理联合实验室, 上海 201800
2 中国科学院大学, 北京 100049
提出了一种基于全光纤多程相位调制的光谱控制方法，并对其进行了理论模拟和实验研究。理论模拟结果表明，调制次数、调制深度、调制信号形状和宽度以及调制信号和光脉冲的时间同步均会对输出光谱的中心波长、光谱宽度和形状产生影响。在实验上对光谱宽度为0.03 nm的注入信号进行多程相位调制，得到了带宽为2.238 nm的输出光谱，实验结果与理论模拟结果相符合。并从实验上研究了不同相位调制信号波形与输出光谱的对应关系，验证了通过控制调制信号波形进行光谱特性控制的可行性。
光纤光学 啁啾脉冲放大 光谱控制 相位调制
1 中国航空工业集团公司洛阳电光设备研究所,河南 洛阳471009
2 西北工业大学理学院，西安710072
轮廓波和方向小波是两种不同的多尺度几何分析方法，弥补了小波方向性的缺失和基的各向同性的缺点，能够更有效地捕捉图像中的几何结构，是有效的图像稀疏表示方法。介绍了轮廓波和方向小波的基本理论，并通过它们在图像融合中的应用来比较它们的性能。
图像变换 轮廓波变换 方向小波变换 图像稀疏表示 image transformation contourlet transform directionalwavelet transform sparse image representation
