Dynamic properties of second-harmonic intensity of a nanosecond-order laser pulse
Dynamic properties of second-harmonic intensity of a nanosecond-order laser pulse
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纳秒级激光脉冲二次谐波强度的动态特性
DOI：
10.1007/s10043-014-0039-4
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发表时间：
2014
期刊：
影响因子：
1.2
通讯作者：
Tetsuo Harimoto and Hidetomo Tsugane
中科院分区：
文献类型：
--
作者：
太田由香;松坂浩志;張本鉄雄;飯島音浩,土井康平,佐藤 孝,大河正志;Tetsuo Harimoto and Hidetomo Tsugane
通过重新检验不完全相位匹配条件的影响，描述了调Q纳秒级激光脉冲二次谐波产生的动态特性的数值和实验结果。对于I型非临界相位匹配方案，利用二次谐波产生中的转换区域，可以有效避免因环境温度变化而导致的二次谐波强度波动。此外，如果基波激光脉冲具有平顶轮廓，则可以通过在再转换区域引入优化的相位失配条件来抑制由于基波强度的变化而导致的二次谐波强度的不稳定性。这些方法有望应用于光学参量啁啾脉冲放大中使用的泵浦激光器的峰值强度稳定。
Numerical and experimental results on the dynamic properties of the second-harmonic generation of Q-switched nanosecond-order laser pulses are described by reexamining the influence of the imperfect phase-matching condition. For a type-I noncritical phase-matching scheme, the fluctuation in the second-harmonic intensity owing to the change in environmental temperature can be effectively avoided by using the conversion region in the second-harmonic generation. In addition, the instability of the second-harmonic intensity owing to the variation in the fundamental intensity might be suppressed by introducing an optimized phase-mismatching condition to the reconversion region if the fundamental laser pulse has a flat-top profile. These approaches are expected to be applied for the peak-intensity stabilization of the pump laser used in optical parametric chirped pulse amplification.