title: Vortex-enhanced coherent-illumination phase diversity for phase retrieval in coherent imaging systems.
abstract: We propose a phase-retrieval method based on the numerical optimization of a new objective function using coherent phase-diversity images as inputs for the characterization of aberrations in coherent imaging systems. By employing a spatial light modulator to generate multiple-order spiral phase masks as diversities, we obtain an increase in the accuracy of the retrieved phase compared with similar state-of-the-art phase-retrieval techniques that use the same number of input images. We present simulations that show a consistent advantage of our technique, and experimental validation where our implementation is used to characterize a highly aberrated 4F optical system.
authors.forename: Santiago
authors.initials: S
authors.lastname: Echeverri-Chacón
authors.forename: René
authors.initials: R
authors.lastname: Restrepo
authors.forename: Carlos
authors.initials: C
authors.lastname: Cuartas-Vélez
authors.forename: Néstor
authors.initials: N
authors.lastname: Uribe-Patarroyo
mesh_terms: D000465:Algorithms; D008029:Lighting; D061848:Optical Imaging / Q000295:instrumentation*; D055620:Optical Phenomena