Phase retrieval with signal bias.
The effect of a uniform measurement bias, due to background light, stray light, detector dark current, or detector offset, on phase retrieval wavefront sensing algorithms is analyzed. Simulation results indicate that the root-mean-square error of the retrieved phase can be more sensitive to an unaccounted-for signal bias than to random noise in practical scenarios. Three methods for reducing the impact of signal bias are presented.
Thurman
Samuel T
ST
The Institute of Optics, University of Rochester, Rochester, New York 14627, USA.
Fienup
James R
JR