Trentelman M, Ross I N, Danson C N
Appl Opt. 1997 Nov 20;36(33):8567-73. doi: 10.1364/ao.36.008567.
A simple model is presented to calculate the effects of the finite size of the diffraction gratings in the compressor of a chirped pulse amplification laser system. A wavelength-dependent clipping at the second grating alters the spectral distribution of the compressed pulses, affecting their time domain as well as their spatial distribution in the focal plane. Laser parameters of paramount importance to laser/plasma interaction experiments such as peak intensity, pulse duration, and prepulse levels are affected by the compressor design. Calculations of the effect of spectral clipping on these parameters for Gaussian, sech(2), and top-hat input spectra are discussed, and the benefit of double-pass compared with single-pass compression is also investigated. As an example, with 300-mm gratings and single-pass compression, for a sech(2) spectrum the pulse length of a 400-fs pulse increases to 459 fs, the peak intensity decreases by 25%, and the focal spot size increases by 8% because of the finite size of the gratings.
提出了一个简单模型来计算啁啾脉冲放大激光系统压缩器中衍射光栅有限尺寸的影响。第二个光栅处与波长相关的限幅改变了压缩脉冲的光谱分布，影响其时间域以及焦平面上的空间分布。对激光/等离子体相互作用实验至关重要的激光参数，如峰值强度、脉冲持续时间和预脉冲水平，会受到压缩器设计的影响。讨论了高斯、sech(2)和平顶输入光谱的光谱限幅对这些参数的影响计算，还研究了双程压缩与单程压缩相比的优势。例如，对于300毫米的光栅和单程压缩，对于sech(2)光谱，由于光栅的有限尺寸，400飞秒脉冲的脉冲长度增加到459飞秒，峰值强度降低25%，焦斑尺寸增加8%。
