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.
© 2011 Optical Society of America
Original Manuscript: January 4, 2011
Revised Manuscript: April 26, 2011
Manuscript Accepted: May 12, 2011
Published: July 1, 2011
Shouqian Chen, Zhigang Fan, Hong Chang, and Zhigao Xu, "Nonaxial Strehl ratio of wavefront coding systems with a cubic phase mask," Appl. Opt. 50, 3337-3345 (2011)