高功率KTP晶体光参量振荡器热效应
Thermal effect of high-power KTP crystal optical parametric oscillator
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摘要: 采用有限元分析方法对KTP晶体内部3维温度分布情况进行了精确计算。根据参量过程满足的能量守恒条件和动量守恒条件，利用KTP晶体的热光色散方程计算了参量过程中温度对相位匹配角、光波走离角、允许角及晶体的有效非线性系数的影响。结果表明：晶体内温度分布不均匀；在沿着通光方向上晶体截面温度分布不同；加强晶体表面冷却效果，可有效降低温度对相位匹配角、光波走离角、允许角及晶体的有效非线性系数的影响。Abstract: The temperature distribution inside KTP crystal was calculated by finite element analysis accurately. The phase matching angles, walk-off angles, tolerance angles and effective nonlinear coefficient of type Ⅱ KTP crystal were calculated according to the conservation of mass and phase matched for parametric process and the thermo-optic dispersion of KTP crystal. The results showed that the distribution of temperature inside the crystal was non-uniform. Along the direction of light, temperature distributions of crystal sections were different. Strengthening the cooling effect of crystal can effectively reduce the temperature influences on the phase matching angles, walk-off angles, tolerance angles and effective nonlinear coefficient of crystal．
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Key words:
- nonlinear optics /
- finite element method /
- ktp crystal /
- optical parametric oscillator /
- thermal effect
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