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利用光线追迹法以及分步傅里叶-贝塞耳变换法,考虑了光阑对光束的拦截和通光作用以及激光放大过程中的增益饱和效应,对环形腔调Q钕玻璃激光系统振荡器输出的光束经卡塞格林式放大器多程放大后的光场演化过程进行了数值模拟,并进行了实验验证。分析得出现有系统中输入输出镜的阶跃反射率分布是导致输出环形光束质量不好的主要原因,并重点对放大器的腔镜部分进行了优化设计,提出了反超高斯反射率分布的输入镜与超高斯反射率分布的输出镜相组合的腔镜对结构。数值模拟结果表明,该腔镜对的使用可大大改善输出环形光束的质量。
The ray tracing method and the step-by-step Fourier-Bessel transformation method are used to consider the interception and pass-through effect of the light beam on the light beam and the gain saturation effect in the laser amplification process. The ring- The output beam was numerically simulated by Cassegrain amplifier after multi-pass amplification, and the experimental verification was carried out. The results show that the step reflectivity distribution of the input / output mirror in the existing system is the main reason for the poor quality of the output toroidal beam, and the cavity mirror part of the amplifier is optimized. The input mirror with anti-Gaussian reflectivity distribution Mirror-to-mirror structure combined with output mirror with super-Gaussian reflectivity profile. Numerical simulation results show that the use of the mirror pair can greatly improve the quality of the output ring beam.