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从二次谐波电场满足的波动方程出发,考虑到介质对二次谐波的吸收以及把完全边界条件应用于基频波和二次谐波在介质的入射面和出射面之间的反射效应,推导出了单光轴非线性薄膜介质中的二次谐波输出功率的计算式.结果表明:当采用复折射率的概念时,可以把非线性无吸收介质的二次谐波输出功率计算式应用到非线性吸收介质二次谐波输出功率计算式中去.
Based on the wave equation that the second harmonic electric field satisfies, taking into account the absorption of the second harmonic by the medium and the application of the complete boundary conditions to the reflection effect of the fundamental frequency and the second harmonic between the incident and outgoing planes of the medium , The calculation formula of the second harmonic output power in single-axis nonlinear thin film media is deduced.The results show that when the concept of complex refractive index is adopted, the output power of second harmonic of non-linear non-absorbing medium can be calculated Applied to the nonlinear absorption medium second harmonic output power calculation.