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利用等离子体非线性效应的三波法是解决“黑障”问题的一种可能的解决方案。从三波非线性理论出发,详细介绍了转化效率的计算方法,进而对不同等离子体电子密度模型下的非线性效应进行分析。数值仿真结果表明:存在一个最优的信号入射角度,当信号以该角度入射时转化效率最大;等离子体厚度会对最佳入射角产生一定影响,当厚度减小时,最佳入射角变大;等离子体电子密度变化范围、厚度、入射波及泵源参数都相同时,共振点处电子密度导数值越大,非线性效应越强。
The three-wave method using the plasma nonlinear effect is a possible solution to the “black barrier” problem. Based on the three-wave nonlinear theory, the calculation method of conversion efficiency is introduced in detail, and then the nonlinear effect under different plasma electron density models is analyzed. Numerical simulation results show that there is an optimal signal incident angle, and the maximum conversion efficiency is achieved when the signal is incident at this angle. The plasma thickness will have an impact on the optimal incident angle. When the thickness decreases, the optimal incident angle will increase. When the plasma electron density variation range, thickness, incident wave and pump source parameters are the same, the greater the electron density derivative value at the resonance point, the stronger the nonlinear effect.