光栅面不平行对压缩脉冲时空特性的影响
Effects of non-parallel grating pair on pulse space-time profiles
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摘要: 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。Abstract: The expressions of the first- to fourth-order dispersion change were derived when there was a small angle between the two gratings in the plane perpendicular to the grooves (diffracting plane). The field distribution of a pulsed super-Gaussian beam passing through a grating pair was derived. The relations between the misalignment and the space-time properties of the output pulse were analyzed. The results show that the pulse is distorted when it passes through the compressor. The misalignment and the lateral spectrum displacement co-make the pulse distortion more serious. When the pulse passes through the compressor twice, the effects of the lateral spectrum displacement is eliminated, but there are wings and the misalignment brings the pulse forward in time domain. The higher order disper
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Key words:
- grating pair /
- misalignment /
- pulse compression /
- high-order dispersion /
- space-time profiles
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