晶体级联方式宽带三倍频方案的参数优化
Optimizing parameters of third harmonic generation of broadband laser using cascade crystals
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摘要: 针对时间位相调制的宽带激光，采用分步离散傅里叶变换及四阶龙格－库塔算法进行数值模拟计算。讨论了采用KDP晶体级联方式时，入射基频光的光强、带宽以及晶体厚度对三倍频转换效率的影响。对采用一块РⅠ类二倍频晶体、一块Ⅱ类和一块Ⅰ类双混频晶体的级联宽带三倍频方式进行了晶体参数的优化。研究结果表明，使用两块级联的KDP晶体作为混频晶体，不仅能有效地提高带宽较宽条件下三倍频光的转换效率，还可以显著增大宽带三倍频的动态范围。经优化后，带宽1.11 nm时入射基频光强在3～8 GW/cm2范围内的三倍频转换效率可保持在60％～70％，比采用单倍频单混频方案时增大了30％～40％。Abstract: As for the temporal phase modulated broadband laser, by using some numerical techniques such as split-step Fourier transformation and fourth-order Runge-Kutta method, the effect of the intensity and bandwidth of the incident fundamental field, as well as that of the lengths of the KDP crystals on the third harmonic conversion efficiency of broadband laser have been discussed. The parameters of the mixers for the scheme of one type I doubler, one type II mixer and one type I mixer in quadrature have been optimized. The results show that using the scheme of cascade crystals can improve the third harmonic conversion efficiency and increase the dynamic range of the broadband laser tripling. For the bandwidth of 1.11 nm and the incident fundamental intensity between 3 GW/cm2 and 8 GW/cm2, the t
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Key words:
- broadband laser /
- harmonic generation /
- cascade crystals /
- optimizing parameters
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