以负色散光栅对压缩器为模型,通过系统的色散误差公式从理论上分析了飞秒啁啾脉冲放大系统中的展宽器和压缩器的调节精度与系统的光栅对距离、光栅入射角、光栅密度等参量的关系,以及不同宽度入射脉冲对系统调节精度的要求。结果表明,必须选择合适的光栅入射角和光栅密度才能在满足系统对综合性能要求的同时降低对系统调节精度的要求;系统中光栅入射角度的调节具有最高的调节精度要求;入射脉冲宽度越窄则对系统的调节精度的要求越高;整个系统的优化中如果考虑各阶色散之间的相互补偿作用,则可以减少光栅对距离和光栅入射角的调节精度要求。

Using the model of grating pair compressor with negative dispersion, the formulae of dispersion errors for the femtosecond chirped-pulse amplification system are presented. The relationship of the adjusting accuracy in the stretcher/compressor versus the distance, incidence angle, and density of the grating pair is discussed theoretically. The demand of adjusting accuracy for different width of input pulse is also studied. The grating incidence angle and the grating density must be selected properly to satisfy the requirement of the system and at the same time decrease the adjusting accuracy. The highest precision is offered to the grating incident angle in the system. The higher alignment sensitivity is needed for the shorter pulse duration. The mutual compensating among varied order dispersion should be considered to optimize whole system, allowing the decrease of the adjusting accuracy.