光栅面不平行对压缩脉冲时空特性的影响

 推导了光栅对压缩器两光栅在垂直于刻线的平面(衍射面)内有一夹角时1至4阶色散变化量的表达式，以及脉冲超高斯光束经光栅对压缩后的场分布。并据此模拟分析了光栅表面平行性失调对输出脉冲时空特性的影响。结果表明：脉冲光束单次通过光栅对时其波形会产生扭曲，光栅对的失调会使脉冲扭曲更加严重；而两次通过光栅对时横向谱移动的影响会消除，但脉冲将出现旁瓣，光栅对的失调使得脉冲在时间上提前，且色散阶数越高色散变化量对压缩脉冲时空特性的影响越大。

Effects of the non-parallel grating-pair to the pulse space-time profiles

The expressions of the first-to fourth-order dispersion change are derived when there is a small angle between the two gratings in the plane perpendicular to the grooves(diffracting plane).At the same time,the field distribution of a pulsed super-Gaussian beam through a grating pair is derived as well.With the model,the relations between the misalignment and the space-time properties of the output pulse were analyzed.The results show that the pulse is distorted at single passing the compressor.At the same time,the misalignment and the lateral spectrum displacement co-make the pulse distortion more serious.When double passed the effects of the lateral spectrum displacement is eliminated,but there are wings and the misalignment brings the pulse forward in time domain.The high order dispersion change affects the pulse space-time profiles more.