Numerical analysis of broadband third-harmonic generation using CsLiB6O10 crystals
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摘要: 为了研究高效的宽带三次谐波转换技术,采用了分步傅里叶变换和四阶龙格-库塔法对CsLiB6O10(CLBO)晶体的宽带三倍频过程进行了数值模拟,分析了单倍单混和单倍双混模式下三倍频转换效率随入射基频光强度、频谱带宽的变化关系,并与KDP晶体的宽带三倍频转换特性进行了对比.在强度为3GW/cm2的0阶超高斯脉冲入射下,得到单倍双混模式下三倍频转换效率达到60%时对应的频谱宽度为650GHz,这与利用KDP晶体在相同条件下获得的频谱宽度相比,提高了近250GHz.研究结果表明,在单倍双混模式下使用CLBO晶体作为频率转换的非线性晶体可以有效地提高宽带三倍频的转换效率.Abstract: To study the efficient broadband third-harmonic generation(THG) technology,the process in CsLiB6O10(CLBO) crystals was studied through numerical simulation based on split-step Fourier transformation and the fourth-order Runge-Kutta method.The dependence of conversion efficiency on input intensity and bandwidth of 1ω waves was analyzed in type-Ⅰ/type-Ⅱ and type-Ⅰ/type-Ⅱ/type-Ⅰ quadrature schemes respectively.As a comparison,broadband THG in KDP crystals was also investigated.Conversion efficiency up to 60% with a bandwidth of 650GHz was achieved in the type-Ⅰ/type-Ⅱ/type-Ⅰ quadrature scheme while the temporal profile of 1ω was assumed to be super-Gaussian(40,exponent) with an intensity of 3GW/cm2.An increase of 250GHz was accomplished in CLBO crystals compared with that in KDP crystals.The obtained results show that broadband THG conversion efficiency can be improved availably in the type-Ⅰ/type-Ⅱ/type-Ⅰ quadrature scheme with CLBO crystals.
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Keywords:
- nonlinear optics /
- broadband THG /
- cascaded crystals /
- CLBO crystals
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