摘要
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 which is built for an amplifier that can generate flat-top laser beam is described.The amplifier uses a multi-level amplification structure.It can output 5 J energy of a single pulse,and the spot size of the flat-top laser beam is 50 mm×50 mm.The liquid-crystal valve in the amplifier can modulate energy distribution of the output spot effectively.The monitoring system is combined with the spatial filter in the amplifier,and by the theory of Fourier-image transfer,it can image energy distribution of the liquid-crystal valve on the monitoring CCD.The compensation system effectively improves the quality of the output laser beam by feeding back the output spot of the amplifier on the liquid-crystal valve.Experimental result shows that energy distribution of the shaped beam is more uniform,and the near-field modulation of the flat-top laser beam generated by the amplifier is 1.64,the softening factor is 0.053.The beam-quality control and improvement are well realized by the monitoring and compensation structure.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2011年第4期115-119,共5页
Acta Optica Sinica
基金
国家863计划(2009AA034701)资助课题
关键词
测量
监测补偿
傅里叶像传递
激光系统
平顶激光光束
measurement
monitoring and compensation
Fourier-image transfer
laser system
flat-top laser beam
