Two-dimensional phase retrieval from two intensity measurements in an
optical imaging system with diffractive loss is studied by using the Y
ang and Gu (YG) algorithm. The diffraction loss is introduced by using
different sizes of a rectangular aperture. The simulation results sho
w that the YG algorithm gives good results even when the system posses
ses large diffractive loss due to the small size of the aperture. In o
rder to improve the convergence rate and to further reduce the final e
rror at convergence, a modification to the YG algorithm is discussed.
Simulation results show a substantial increase in the convergence rate
and reduction in the final error with the modified algorithm as compa
red to the original algorithm. The resulting procedure is believed to
be a good approach for reaching the global minimum.