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为了解决空间滤波器滤波针孔堵孔问题,提出了一种新型柱面镜空间滤波器,新型柱面镜空间滤波器由柱面镜和狭缝构成。利用线性传输理论,对高功率激光束在新型柱面镜空间滤波器中的传输特性进行了数值模拟。结果表明:新型柱面镜空间滤波器的焦斑面积比传统滤波器大,而焦斑功率密度较小;新型柱面镜空间滤波器的滤波效果与传统滤波器相同,近场均匀性也相同。因此新型柱面镜空间滤波器能够抑制空间滤波器堵孔效应,可以缩短空间滤波器系统透镜焦距,从而提高功率装置的整体性价比。由此,采用新型柱面镜空间滤波器替换传统球面镜空间滤波器具有可行性。
In order to solve the pinhole blocking problem of the space filter, a new cylindrical mirror spatial filter is proposed. The new cylindrical mirror spatial filter consists of a cylindrical mirror and a slit. Using the theory of linear transmission, the transmission characteristics of the high power laser beam in the novel cylindrical mirror spatial filter were numerically simulated. The results show that the focal length of the new cylindrical mirror spatial filter is larger than that of the traditional one and the power density of the focal spot is smaller. The new cylindrical mirror spatial filter has the same filtering effect as the traditional one and the near-field uniformity is the same . Therefore, the new cylindrical mirror spatial filter can suppress the clogging effect of the spatial filter, which can shorten the focal length of the spatial filter system lens, thereby improving the overall cost performance of the power device. Therefore, it is feasible to replace the traditional spherical mirror spatial filter with the new cylindrical mirror spatial filter.