中国激光, 2002, 29 (s1): 69, 网络出版: 2013-02-23  

高强度三倍模拟计算与实验

Two-dimension Numerical Simulation Study on High-power High-efficiency Tripling Harmonic
作者单位
1 中国工程物理研究院高温髙密度等离子体物理国家重点实验室, 绵阳 621900
2 四川大学, 成都 610054
摘要
对大口径、髙功率情况下的三次谐波转换,选择KDP晶体Type I/Type II匹配角度失谐的三倍频方案,并从非线性三波耦合方程组出发,采用离散傅里叶变换和四阶龙格-库塔(R-K)积分方法,编制了二维模拟三次谐波转换的计算程序。计算了各种晶体厚度和不同失谐角条件下,二、三次谐波的转换特性和效率。并对入射基频光为六阶超高斯分布时的三倍频器进行了优化,三倍频转换效率达80%, 此时具有较大的动态范围和较髙的三倍频转换效率, 并进行了实验研究。
Abstract
Type I/Type II angle-detuning tripling frequency scheme of KDP crystal was chose for triple harmonic conversion with large aperture and high power. Based on three-wave mixing nonlinear coupling equation, wrote a two. dimension program for numerical simulation triple harmonic conversion by introducing discrete Fourier transform and a fourth-order Runge-Kutta integrating method. With the code, conversion features and efficiencies of second and third harmonics were calculated with different thickness of crystal and different angle-detuning. The tripling frequency system is also optimized assuming the intensity distribution of 1ω is super Gaussian distribution with sixth-order. The results showed that the system has both broad dynamic range and more high conversion efficiency.

马驰, 魏晓峰, 袁静, 骆永全, 王建军, 粟敬钦, 何钰娟. 高强度三倍模拟计算与实验[J]. 中国激光, 2002, 29(s1): 69. MA Chi, WEI Xiaofeng, YUAN Jing, LUO Yong-quan, WANG Jian-jun, SU Jing-qin, HE Yu-juan. Two-dimension Numerical Simulation Study on High-power High-efficiency Tripling Harmonic[J]. Chinese Journal of Lasers, 2002, 29(s1): 69.

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