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小宽带光谱色散匀滑光束传输特性研究
Propagation characteristics of small-bandwidth pulsed b eams with smo othing by sp ectral disp ersion in high p ower laser system
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摘要: 利用激光聚变研究中心自主开发的小宽带传输放大软件对小宽带光谱色散匀滑(SSD)光束进行具有“时间、空间、光谱分辨”的传输模拟，研究了SSD光束通过空间滤波器和自由空间的传输特性。给出了时间、空间、光谱的对应分布图，对比分析了SSD光束与非SSD光束的传输效应。研究结果对于合理设计SSD光束的发散角与空间滤波器小孔之间的匹配关系、选择适宜的调制频率，以及选择束匀滑色循环数等都有重要意义，同时对于光路设计特别是细光束自由传输距离的设计具有指导意义。Abstract: In this paper, we numerically study the propagation characteristics through spatial filter and free space of small-bandwidth pulsed beams with smoothing by spectral dispersion (SSD) in high power solid-state laser system. The numerical simulation with time-, space-and spectrum-resolution is achieved by using laser propagation and amplification software developed by Research Center of the Laser Fusion. The graphs of corresponding time-, space- and spectrum-distribution are presented, and the propagation characteristics between the SSD and non-SSD beam are compared. Besides, the effects of some SSD parameters on the diffraction propagation are further discussed. The results can help to choose the proper beam divergence of SSD which matches with the size of the spatial filter hole, to design the appropriate modulation frequency and the color circle number and so on. Moreover, it could guide the design of the light path, especially the design of free space propagation of small-diameter laser.
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