Effect of misalignment of grating pair grooves on temporal profiles of chirped-pulse
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摘要: 为了研究啁啾脉冲在光参量啁啾脉冲放大系统中传输时脉冲变化的情况,采用光线追迹法和4阶龙格-库塔法,得到了压缩器光栅对刻线失配对输出脉冲宽度和时间波形的影响的模拟结果。结果表明,当光栅对刻线失配且夹角约在±4°范围内时,若只考虑2阶色散的影响,初始啁啾导致脉冲宽度略小于无初始啁啾脉冲的宽度。当考虑到3阶、4阶及更高阶色散时,脉冲宽度大于种子脉冲的初始宽度。当入射脉冲具有正啁啾时,出射脉宽随夹角α的增大不断增加,但当具有负啁啾时,脉宽随α的增大先减小后再增大。光栅G2顺时针旋转时的脉宽变化与G2逆时针旋转时脉宽变化相同。另外,初始啁啾对出射脉冲出现的预脉冲、尾脉冲有一定的削弱作用,负啁啾对脉冲展宽和失真的影响明显小于相应的正啁啾。Abstract: The effect of misalignment of grating grooves on the output pulse width and temporal profiles was numerically simulated with ray-tracing method and Runge-Kutta method.When the angle of grating grooves is within the range of士4°,the pulse width induced by the original chirp becomes narrower if only considering group delay dispersion(GDD).However,the pulse width becomes broader than that of seed pulse when considering third order dispersion (TOD) or fourth order dispersion (FOD),even higher order dispersion.When the input pulse is with positive chirp,the pule width increases with the angle a continuously.However,when the input pulse is with negative chirp,the pulse width increases with the angle a first,and then decreases.The change of the pulse width is the same with grating G2 revolving clockwise or anti-clockwise.Furthermore,the original chirp makes the pre-pulse and post-pulse weaker.The effect of the negative chirp on pulse width and distortion is much weaker than that of the positive chirn.
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