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根据激光束的空间分布为高斯型分布，文中推导了理想和实际光学扫描系统的点扩散函数，理想系统的点扩散函数为δ函数，实际系统的点扩散函数为高斯函数。
According to the Gaussian distribution of the spatial distribution of the laser beam, the point spread function of ideal and actual optical scanning system is deduced. The point spread function of the ideal system is δ function, and the actual system point spread function is Gaussian function.