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利用柯林斯(Collins)传输公式和将硬边光阑展开为有限个复高斯函数之和的方法,分析了在静态高功率激光器系统中选取不同尺寸的空间滤波器小孔对谱色散匀滑(SSD)效果的影响,并且通过K.R.Manes等提出的统计光学模型,给出了存在相位畸变和振幅调制时小孔选取的模拟计算方法。数值模拟表明,在神光Ⅱ第9路多功能激光器系统中,目前使用的空间滤波器小孔会使部分色散光束的光谱成分被阻断,使得焦斑通量对比度从无孔时的22%增大到36%,影响光SSD效果;分析给出了满足光SSD使用的空间滤波器的小孔尺寸。
Based on the Collins transfer formula and the method of expanding the hard-edge aperture to the sum of finite complex Gaussian functions, the influence of spatial filter aperture with different size on the dispersion of spectrum dispersion (SSD ), And through the statistical optical model proposed by KRManes et al., A simulation calculation method for the selection of small holes in the presence of phase distortion and amplitude modulation is given. Numerical simulation shows that in the SG 9th multi-purpose laser system, the aperture of the currently used spatial filter will block the spectral components of the partially disperse beam so that the focal spot flux contrast decreases from 22% Increased to 36%, affecting the performance of optical SSD; analysis gives the size of the aperture to meet the spatial filter used by optical SSD.