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中文摘要：
数值研究Z扫描实验高斯分解法分析的截断近似合理性，计算Z扫描实验的透射比，得到在薄样品或近轴情况下，对于小相位移高斯分解法收敛很快，取前3项是合理的；在大相位移情况下，取前3项误差较大，需要计算至少前4项．
英文摘要：
The rationale for cut-off approximation in studied by numerical calculation. Transmittance function Gaussian decomposition of Z-scan experiment is of Z-scan experiment on nonlinear thin film is calculated. With thin samples, or under on-axis situation, and little nonlinear phase, approximation of calculating the first three items of function is reasonable since transmittance function converges quickly; for large nonlinear phase, error by calculating the first three items only cannot be ignored, instead, the first four items of funetion have to be calculated to obtain reasonable result.
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