高功率高效率三次谐波二维数值模拟研究
Twodimension numerical simulation study on highpower highefficiency tripling harmonic
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摘要: 对大口径、高功率情况下的三次谐波转换,选择KDP晶体TypeⅠ/TypeⅡ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。Abstract: Type Ⅰ/ Type Ⅱ angledetuning tripling frequency scheme of KDP crystal was chose for triple harmonic conversion with large aperture and high power. Based on threewave mixing nonlinear coupling equation, wrote a twodimension program for numerical simulation triple harmonic conversion by introducing discrete Fourier transform and a fourthorder 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 angledetuning. Tripling frequency system assuming that the intensity distribution of 1ω is super Gaussian distribution with sixthorder is optimized. The results showed that the system has both broad dynamic range and more high conversion efficiency.
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Key words:
- thirdharmonic conversion /
- numerical simulation /
- nonlinear crystal
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