NONITERATIVE RECONSTRUCTION OF COMPLEX-VALUED OBJECTS FROM 2 INTENSITY MEASUREMENTS

We present results obtained from the application of a novel phase-retr ieval algorithm for recovering a complex-valued object from a set of t wo intensity measurements. The algorithm requires two intensity measur ements at different distances from a weak scatterer, where the total t ransmitted field is composed of the coherent sum of an incident plane wave and the scattered wave. The algorithm is noniterative and does no t have the convergence problems associated with iterative algorithms. The new technique shows great promise for inverse-scattering applicati ons, such as optical diffraction tomography and in-line holography of complex-valued objects, with the aim of eliminating the twin-image pro blem. Results are presented from a computer simulation of a simple obj ect and from experimental data obtained from a microlens array. Our re sults obtained using the new algorithm on experimental data compare we ll with those obtained with a modified form of the Gerchberg-Saxton al gorithm, at a significantly reduced computational cost.