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结合美国国家点火装置(NIF)的部分参数,利用两镜型线聚焦空间滤波器(SSF)来替代主放大腔中的针孔滤波器,对其在高功率激光装置中的应用进行了初步的研究。以NIF为例,SSF的应用可使远场强度降低两个数量级,使腔空间滤波器和放大腔分别缩短约6.2450m(27%)和13.8707m(30%),而放大腔中远场强度的降低以及去掉传输空间滤波器中的滤波光阑,又使得主光路中基本无等离子体堵孔的问题。同时,基于平面化离轴偏角的设计思想并结合放大腔中变形镜与反射镜互成物像面的特点,对SSF构成的放大腔进行了离轴多程设计以避免放大自发辐射,为SSF的实际应用以及高功率激光装置的进一步发展奠定了基础。
Combined with some parameters of the National Ignition Device (NIF), the pinhole filter in the main amplifier cavity is replaced by a two-mirror linear focusing spatial filter (SSF), and its application in high power laser devices is preliminary the study. Taking NIF as an example, the application of SSF can reduce the far-field intensity by two orders of magnitude, shortening the cavity spatial filter and the amplification cavity by about 6.2450m (27%) and 13.8707m (30%), respectively, while amplifying far- Reduce and remove the transmission aperture filter in the filter aperture, but also makes the main light path of plasma-free plugging problem. At the same time, based on the design idea of planar off-axis declination and combined with the characteristics of the mutual imaging surface between the deformable mirror and the mirror in the amplifying chamber, the amplifying chamber formed by the SSF is designed with off-axis multi-pass to avoid amplifying spontaneous emission. The practical application of SSF and the further development of high power laser devices have laid a foundation.