有限束宽下超高斯光束经光栅对压缩的研究

利用有限束宽下入射脉冲通过光栅对压缩的理论模型,从脉冲光束的傅里叶角谱入手,分析了脉冲超高斯光束单次及两次通过光栅对时的变换特性,以及高阶色散对脉冲压缩的影响。结果表明,脉冲超高斯光束单次通过光栅对压缩器时,横向谱移动使得出射光束产生时间相关的空间移动而两次通过压缩器时则会消除此种影响。高阶色散不仅影响输出脉冲的时间特性同时还影响其空间特性,导致输出脉冲波形扭曲,产生时空畸变。

Study of super-Gaussian beam through grating pair compression in the case of finite beam size

Using the theoretical model of pulsed beam through gra ting pair in the case of finite beam size and starting from the Fourier angle spectrum of the pulsed beam,the spatial and temporal properties of the pulsed super-Gaussian beam single and double passing compressor and the effects of high-order dispersion are studied.It's found that when the pulsed super-Gaussian beam once passes through the grating pair,the time-dependent spatial shift will be introduced in the output pulse by the transverse spectrum shift,but the effect will be eliminated when twice passes and that high-order dispersion affects the spatial and temporal properties of the output pulse,causes the pulse front distortion and induces space-time aberration in the output pulse.