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采用逆达曼光栅将二维锁相相干的激光阵列进行相干合束并进行孔径装填是获得远场单一主瓣大功率高光束质量激光输出的一种有效技术方案,将其应用于大尺寸5×5固体激光相干阵列相干合束中,并进行了固体激光阵列合束孔径装填的理论分析和原理性验证实验,测量了系统的实际合束效率,同时进行了后焦面逆达曼光栅的加工和放置误差对合束效率影响的详细分析。实验结果表明,逆达曼光栅用于固体激光阵列相干合束是一种有效的技术方案,且可以通过调节光栅周期和傅里叶透镜焦距来适应系统对激光阵列占空比的要求。这对于开发基于逆达曼光栅相干合束的高功率高光质量的全固态激光系统具有重要的意义。
Using Inverse Dahman grating to coherently coherently couple two-dimensional locked laser arrays and perform aperture loading is an effective technical solution to obtain high-power and high-beam-quality laser output of a single mainlobe in the far field, and is applied to large-size 5 × 5 solid-state laser coherent array coherence beam bundle, and the theoretical analysis and theoretical verification experiments of the solid-laser array packed aperture packing were carried out. The actual combined efficiency of the system was measured. At the same time, Detailed analysis of the effects of machining and placement errors on the efficiency of the beam combination. The experimental results show that the anti-Dahman grating is an effective technique for solid-state laser array coherence and the duty cycle of the laser array can be adapted to the system by adjusting the grating period and the focal length of the Fourier lens. This is of great significance for the development of all-solid-state laser system with high power and high light quality based on the coherent interference of the back-handed grating.