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Starting from the Frantz-Nodvik equation and Huygens-Fresnel diffraction integral and using the fast Fourier transform and successive iteration method, we studied the inverse problem of a laser amplifier system containing a spatial filter, i-e-, to find the initial input temporal pulse profile, am-plitude and phase distributions from the required output temporal, spatial pulse profile and fluence, as well as the given amplifier and spatial filter parameters-
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