利用横向剪切干涉法和轴向全息干涉法分别测量了处于大气压下和真空状态中的空间滤波器的窗口畸变;滤波器处于真空状态下,中心区域畸变量小于0.1λ,边缘最大的畸变量为0.41λ;分别利用全息复元法和数值计算法给出了这种畸变光束的焦体分布;计算了该窗口在不同功率密度的激光作用下的非线性畸变,它是高功率激光系统中的主要象差来源.

The distortion of the windows of spatial filters under the vacuum condition and the atmospheric state has been measured by using lateral transverse shearing interf erometry and holographic interferometry. The distortion in the central area of the vacuum spatial filter is less than 0.1, and that periphery is about 0.41. And the intensity distribution of the laser beam in focal volume is given by means of holographic reconstructing image and numerical processing methods. The nonlinear effect for high power laser beams is also computed.