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介绍了为一个平顶激光光束放大器所搭建的监测和补偿系统。该放大器采用多级放大结构,能够输出单脉冲能量5J,光斑尺寸50mm×50mm的平顶激光光束。放大器内部的液晶光阀可以对输出光斑的能量分布进行有效的调制。监控系统与放大器中的空间滤波器相结合,通过傅里叶像传递的原理,将液晶光阀上的能量分布成像到监测CCD上。补偿系统通过将放大器输出光斑反馈到液晶光阀上,有效的提高了输出激光光束的质量。实验结果表明,整形后的光斑内部能量分布更加均匀,放大器输出的平顶激光光束近场调制度为1.64,软化因子为0.053。所设计的监测和补偿系统较好的实现了对光束质量的控制和改善。
A monitoring and compensation system for a flat-top laser beam amplifier is presented. The amplifier uses multi-stage amplification structure, capable of outputting single pulse energy 5J, spot size 50mm × 50mm flat-top laser beam. The liquid crystal light valve inside the amplifier can modulate the energy distribution of the output spot effectively. Monitoring system and the amplifier in the spatial filter combination, through the principle of Fourier image transmission, the liquid crystal light valve on the energy distribution imaging to monitor CCD. Compensation system by the amplifier output spot back to the liquid crystal light valve, effectively improve the quality of the output laser beam. The experimental results show that the energy distribution of the shaped spot is more uniform, the near-field modulation of the flat-top laser beam output by the amplifier is 1.64, and the softening factor is 0.053. The designed monitoring and compensation system better controls and improves the beam quality.