应用于多程脉冲激光放大器的宽带放大算法研究  

Algorithm Research on Broadband Amplification Applied to the Multi-pass Pulsed-laser Amplifier

作　　者：张福领[1] 张军勇[2] 

机构地区：[1]中国电子科技集团公司第二十七研究所,郑州450047 [2]中国科学院上海光学精密机械研究所,上海201800

出　　处：《科学技术与工程》2013年第19期5487-5491,共5页Science Technology and Engineering

摘　　要：依据激光在均匀加宽增益介质中的宽带放大理论模型,在亚纳秒量级,分别使用短时傅里叶变换、极化强度时域解析法和龙格-库塔法等三种数值模拟方法详细研究了时间域位相调制脉冲激光在多程放大器中的宽带放大效应,得到了激光通过多程放大器之后的脉冲时空波形演化。结果表明,在脉冲激光持续时间远大于增益介质退相时间的条件下,极化强度时域解析法在三种数值模拟方法中耗时最少、精度最高;而且该方法可以在几十皮秒至纳秒量级使用。Based on the theory of pulsed-laser amplification in the homogeneously broadening medium, short- time Fourier transform, analytic electric polarization in the temporal domain and Runge-Kutta method were all suc- cessfully applied to solving phase-modulated pulse propagation in the multi-pass laser amplifier in the sub-nanose- cond time scale. The evolution of the spatial and temporal pulse profile was investigated in detail. The results indi- cate that analytic electric polarization in the temporal domain is more effective than other approaches on condition that the pulse duration is much too longer than the dephasing time of gain medium. Consequently, the method men- tioned-above can be safely used for broadband amplification from pico-second to nanosecond pulsed-laser.

关 键 词：宽带放大 位相调制脉冲激光 短时傅里叶变换 极化强度时域解析法 龙格-库塔法 

分 类 号：TN243[电子电信—物理电子学]