高功率高效率三次谐波二维数值模拟研究  

Two-dimension numerical simulation study on high-power high-efficiency tripling harmonic

作　　者：马驰[1] 何钰娟[2] 魏晓峰[1] 袁静[1] 骆永全[1] 王建军[1] 粟敬钦[2] 

机构地区：[1]中国工程物理研究院高温高密度等离子体物理国家重点实验室,四川绵阳919988信箱621900 [2]四川大学光电系,四川成都610054

出　　处：《强激光与粒子束》2000年第F11期131-136,共6页High Power Laser and Particle Beams

基　　金：国家 8 6 3惯性约束聚变领域资助课题

摘　　要：对大口径、高功率情况下的三次谐波转换 ,选择 KDP晶体 Type / Type 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 ,采用离散傅立叶变换和四阶龙格 -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 % 。Type Ⅰ/ Type Ⅱ angle-detunin g tripling frequency scheme of KDP crystal was chose for triple harmonic conversio n with large aperture and high power. Based on three-wave mixing nonlinear coup ling equation, wrote a two-dimension program for numerical simulation triple ha rmonic conversion by introducing discrete Fourier transform and a fourth-order Runge-Kutta integrating method. With the code, conversion features and efficien cies of second and third harmonics were calculated with different thickness of c rystal and different angle-detuning. Tripling frequency system assuming that th e intensity distribution of 1ω is super Gaussian distribution with sixth-o rder is optimized. The results showed that the system has both broad dynamic ran ge and more high conversion efficiency.

关 键 词：三次谐波转换 数值模拟 非线性晶体 三倍频器 转换特性 KDP晶体 非线性光学 高功率 高效率 

分 类 号：TN771[电子电信—电路与系统] O734[理学—晶体学]