激光束振幅曲线对二次谐波发生效率的影响

Pub Date : 2024-07-03 DOI:10.1134/S1024856024700337

V. O. Troitskii

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引用次数: 0

摘要

摘要非线性晶体中激光辐射谐波产生的效率是应用非线性光学中最紧迫的问题之一。这项工作从理论上研究了汇聚（聚焦到晶体中）激光束中的二次谐波产生（SHG）。首次估算了基本激光辐射光束（透镜前）的振幅轮廓（AP）对 SHG 效率以及最佳聚焦和波谐参数的影响。结果表明，聚焦的最佳值，尤其是波谐参数的最佳值，会因振幅曲线的不同而在很大范围内变化。结果表明，AP 对有效孔径长度有很大影响，而有效孔径长度主要限制了 SHG 效率。优化 AP 可使 SHG 效率提高不超过 10%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Effect of Laser Beam Amplitude Profile on Second Harmonic Generation Efficiency

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Effect of Laser Beam Amplitude Profile on Second Harmonic Generation Efficiency

The efficiency of laser radiation harmonic generation in nonlinear crystals is one of the most pressing problems in applied nonlinear optics. This work theoretically studies the second harmonic generation (SHG) in a converging (focused into a crystal) laser beam. The effect of the amplitude profile (AP) of fundamental laser radiation beam (before the lens) on the SHG efficiency and on optimal focusing and wave detuning parameters is estimated for the first time. It is ascertained that the optimal values of focusing and especially wave detuning parameters vary in very wide ranges depending on the AP. A strong influence of the AP on the effective aperture length, which mainly limits the SHG efficiency, is shown. Optimization of the AP enables increasing the SHG efficiency by no more than ∼10%.

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