单轴晶体Ⅰ类相位匹配时的转换效率分析
Analysis of second-harmonic conversion efficiency by type Ⅰ phase matching in uniaxial crystals
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摘要: 在考虑了二次谐波的吸收对转换效率影响的情况下，由光在介质中的波动方程，推导出负单轴晶体Ⅰ类相位匹配时平面二次谐波的耦合波方程和二次谐波转换效率的理论公式。在此基础上，再考虑走离效应的影响，给出了二次谐波转换效率的理论公式。根据这些公式，以负单轴晶体K2Al2B2O7（KABO）为例，对二次谐波的转换效率进行了数值计算。结果表明：考虑二次谐波的吸收时，存在倍频晶体长度的最佳值，当倍频晶体取该值时，二次谐波的转换效率最高；走离效应的存在使二次谐波的转换效率降低。Abstract: Coupled-wave equations and conversion efficient theory formulas for second harmonic plane wave of type Ⅰ phase matching in uniaxial crystals were obtained from wave equation of medium when second-harmonic wave absorption was taken into account. Based on the formulas, theoretical conversion efficiency formulas for second harmonic plane wave were gotten when second-harmonic wave walk-off effect was taken into account. Using type Ⅰ phase matching in uniaxial crystal K2Al2B2O7 (KABO) for example, conversion efficient of second harmonic plane wave was calculated according to the formulas. The result indicates that the optimum length of frequency doubling crystal was in existence when second-harmonic wave absorption was taken into account. The conversion efficient of second harmonic plane wave
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Key words:
- uniaxial crystal /
- phase matching /
- conversion efficient /
- kabo crystal
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