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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 % ,此时具有较大的动态范围和较高的三倍频转换效率
For the third harmonic conversion in the case of large caliber and high power, the third frequency doubling scheme of KDP crystal Type / Type matching angle detuning is selected. Based on the nonlinear three-wave coupled equations, the discrete Fourier transform and fourth order Runge- Kuta (RK) integral method, the preparation of two-dimensional simulation of the third harmonic conversion calculation program. The conversion characteristics and efficiency of the second and third harmonics under various crystal thickness and different detuning angles were calculated. And the third frequency multiplier with sixth-order super-Gaussian distribution is optimized, and the conversion efficiency of the third harmonic is 80%. In this case, it has larger dynamic range and higher conversion efficiency of the third harmonic