Webb B, Guardalben M J, Dorrer C, Bucht S, Bromage J
Appl Opt. 2019 Jan 10;58(2):234-243. doi: 10.1364/AO.58.000234.
The effects of pulse compressor grating misalignment on pulse duration and focusability are simulated for chirped-pulse-amplification systems of varying bandwidths, beam sizes, groove densities, and incident angles. Tilt-alignment tolerances are specified based on a 2 drop in focused intensity, illustrating how tolerances scale with bandwidth and compressor beam size, which scales with energy when transformed via known grating damage thresholds. Grating-alignment tolerance scaling with grating groove density and incident/diffracted angles is investigated and applied to compressor design. A correlation between grating tip and in-plane rotation error sensitivity is defined and used to compensate residual out-of-plane angular dispersion, even for ultra-broadband pulses. Simulation of dispersion compensation methods after grating misalignment is shown to mitigate pulse lengthening, limited by temporal contrast degradation and higher-order effects for ultrabroad bandwidths.
针对不同带宽、光束尺寸、光栅密度和入射角的啁啾脉冲放大系统，模拟了脉冲压缩器光栅失准对脉冲持续时间和聚焦能力的影响。基于聚焦强度下降2%来确定倾斜对准公差，说明了公差如何随带宽和压缩器光束尺寸而变化，当通过已知的光栅损伤阈值进行变换时，光束尺寸随能量而变化。研究了光栅对准公差随光栅密度以及入射角/衍射角的变化情况，并将其应用于压缩器设计。定义了光栅倾斜和平面内旋转误差灵敏度之间的相关性，并用于补偿残余的面外角色散，即使对于超宽带脉冲也是如此。结果表明，光栅失准后色散补偿方法的模拟可减轻脉冲展宽，但受时间对比度下降和超宽带带宽的高阶效应限制。
