波前畸变会影响平行光栅对压缩器输出脉冲的可压缩性和远场焦斑的质量。结合光线追迹法和夫琅禾费远场衍射原理建立了平行光栅对压缩器理论模型。同时分析了输入脉冲的波前误差、光栅衍射面的形变以及光栅波像差对压缩器输出脉冲远场焦平面时空特性的影响, 并采用蒙特卡罗方法数值模拟分析了其误差容许范围。为高功率激光装置中平行光栅对压缩器中进行波前畸变和光栅质量的控制提供了理论参考。

Wavefront distortion affects the compressibility and the far-field focal spot quality of the output laser pulse of parallel grating pair compressor. We establish a theoretical model of parallel grating pair compressor based on ray-tracing method and principle of Fraunhofer far-field diffraction, and analyze the effects of wavefront error of input pulse, the deformation and wave aberration of grating diffraction surface on the spatial-temporal property of the far-field focal plane of the compressor output pulse. The corresponding error tolerances are presented based on Monte-Carlo simulation. The results provide a theoretical reference of wavefront distortion correction and grating quality control for parallel grating pair compressor in high-power laser facilities.