title: Nonaxial Strehl ratio of wavefront coding systems with a cubic phase mask.
abstract: An approximate expression of the peak position of the point-spread function (PSF) of wavefront coding systems with a cubic phase mask (CPM) is derived and verified by simulation results. An approach called the nonaxial Strehl ratio (NASR) is used to evaluate the performance of wavefront coding systems with defocus aberrations. The characteristics of the NASR are investigated. The relationships between the NASR and the similarity of out-of-focus modulation transfer function (MTF) and recoverability of blurred encoding images are presented, and some useful guidelines are given for the optimization of phase mask parameters according to these relationships.
authors: Research Center for Space Optics Engineering, P.O. Box 307, Harbin Institute of Technology, Heilongjiang, Harbin 150001, China. csq_hit@163.com
authors: Shouqian
authors: S
authors: Chen
authors: Zhigang
authors: Z
authors: Fan
authors: Hong
authors: H
authors: Chang
authors: Zhigao
authors: Z
authors: Xu