title: Algorithm for near-field reconstruction based on radial-shearing interferometry.
abstract: A new iterative algorithm to be used to precisely reconstruct near-field distribution from an interferogram of a laser output generated by a cyclic radial-shearing interferometer is proposed. First, by use of a window function around the zero-frequency part of the Fourier transform of the interferogram and calculation of the inverse Fourier transform of the zero-frequency part, we obtain the background intensity distribution of the interferogram. Then, according to the iterative algorithm, the near-field distribution of the laser output is precisely reconstructed from the background intensity distribution obtained in the first step. A numerical simulation and an actual experiment of the near-field reconstruction of the laser output with arbitrary amplitude distribution are implemented successfully.
authors.affiliation: School of Electronics and Information, Sichuan University, 610064 Chengdu, China. dahai_li@sohu.com
authors.forename: Dahai
authors.initials: D
authors.lastname: Li
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
authors.forename: Xiaoshun
authors.initials: X
authors.lastname: Li
authors.forename: Hongkun
authors.initials: H
authors.lastname: Yang
authors.forename: Huaixin
authors.initials: H
authors.lastname: Chen