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板条激光器初始光束为矩形光束,光束的发散角与半径在相互垂直方向上相差很大。因此,光束整形系统是板条激光器能够实际应用的关键技术之一。以2kW射频板条CO_2激光器为基础,针对双柱面镜整形系统与带空间滤波器整形系统,应用特征向量法与柯林斯公式进行了仿真分析。给出了光束通过这两种整形系统后光强的分布与光束半径的变化。结果表明,板条激光器的矩形光束经过这两种整形系统后都能转变为近似圆形分布,两个方向上的半径差值小。但光束通过双柱面镜整形系统后非稳方向光束质量没有得到改善,聚焦后存在旁瓣,能量占比约为9%。带空间滤波器整形系统则能够将旁瓣完全滤除,提升了光束质量。
The initial laser beam slab beam is a rectangular beam divergence and radius of the beam in the direction perpendicular to each other a great difference. Therefore, the beam shaping system is one of the key technologies that can be practically applied to slab lasers. Based on the 2kW RF slab CO_2 laser, aiming at the double cylinder mirror shaping system and the spatial filter shaping system, the eigenvector method and Collins formula are used to simulate and analyze. The distribution of light intensity and the change of beam radius are given after the beam passes through the two shaping systems. The results show that the rectangular beam of slab laser can be transformed into an approximate circular distribution by the two shaping systems with a small difference in radius between the two directions. However, the beam does not improve the beam quality in the unsteady direction after passing through the double cylinder mirror shaping system. There is side lobes after focusing, accounting for about 9% of the energy. With spatial filter shaping system can be completely sidelobe filter, improve the beam quality.