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从非简谐振子模型出发，通过求解迭代方程，计算出三阶非线性极化率及四阶非线性极化率，并给出了高阶非线性极化率的普适公式
Based on the non-harmonic oscillator model, the third-order nonlinear polarizability and the fourth-order nonlinear polarizability are calculated by solving the iterative equation, and the general formula of high-order nonlinear polarizability is given