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研究了大口径级联空间滤波器中色差造成的离焦色散与传输时间延迟对超短脉冲波形与时间信噪比的影响。针对神光-5PW高功率超短脉冲系统,通过数值模拟,定量分析了光束口径、色差等因素与近远场脉冲波形畸变和时间信噪比退化的关系。从脉冲波形和时间信噪比的角度,给出了大口径空间滤波器消色差后残余色差的容忍范围,为高功率超短脉冲系统中空间滤波器的设计与优化提供了理论依据。
The influence of chromatic dispersion in the large-aperture cascaded spatial filter on the ultra-short pulse waveform and the time signal-to-noise ratio is studied. According to the SG-5PW high-power ultra-short pulse system, the relationship between the beam diameter, chromatic aberration and the far-field pulse waveform distortion and the time signal-to-noise ratio degradation is quantitatively analyzed through numerical simulation. From the perspective of pulse shape and time signal to noise ratio, the tolerable range of residual color difference of large aperture spatial filter is given, which provides a theoretical basis for the design and optimization of spatial filter in high power ultrashort pulse system.