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高功率超短激光脉冲信噪比的研究
引用本文:王科,钱列加. 高功率超短激光脉冲信噪比的研究[J]. 强激光与粒子束, 2006, 18(1): 1-5
作者姓名:王科  钱列加
作者单位:复旦大学 光科学与工程系, 上海 200433
摘    要: 针对高功率激光系统中信噪比低的问题,基于描述超短脉冲传输的非线性薛定谔方程进行数值模拟,研究了高阶群速度色散、光谱调制及自相位调制对脉冲信噪比的影响;新建立了用于分析光栅平整度对脉冲信噪比的影响的物理模型并进行了相应的模拟,分析了光栅的质量要求或补偿精度。研究表明:对于100 fs的高斯脉冲,要保证信噪比达到108,应将三阶色散量限制在4.8×105 fs3以下,B积分的值应小于0.2,光谱的调制幅度应小于10-4,光栅平整度应优于λ/100。

关 键 词:信噪比  高阶色散  自位相调制  光栅平整度
文章编号:1001-4322(2006)01-0001-05
收稿时间:2005-01-21
修稿时间:2005-09-28

Signal-to-noise ratio of ultrashort high-power pulse
WANG Ke,QIAN Lie-jia. Signal-to-noise ratio of ultrashort high-power pulse[J]. High Power Laser and Particle Beams, 2006, 18(1): 1-5
Authors:WANG Ke  QIAN Lie-jia
Affiliation:Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China
Abstract:Based on the nonlinear Schrdinger equation, a simulation was carried out to solve the problem of the signal-to-noise ratio being low. The research dealt with the influence of higher-order dispersion, spectral modulation and self-phase-modulation on the signal to noise ratio. Furthermore, a physical model was built to analyze the impact of the flatness of gratings. The results show that for a 100 fs input Gaussian pulse, in order to make the signal-to-noise ratio bigger than 108, the third-order-dispersion should be kept below 4.8×105 fs3, the B-integral below 0.2, the amplitude of the modulation of spectrum below 10-4 and the flatness of gratings smaller than λ/100 .
Keywords:Signal-to-noise ratio  Higher order dispersion  Self-phase-modulation  Flatness
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