Cotte, YannToy, Muhammed FatihShaffer, EtiennePavillon, NicolasDepeursinge, Christian2010-06-092010-06-092010-06-09201010.1364/OL.35.002176https://infoscience.epfl.ch/handle/20.500.14299/50725WOS:000279435900022We report the experimental observation of systematically occurring phase singularities in coherent imaging of sub-Rayleigh distanced objects. A theory that relates the observation to the sub-Rayleigh distance is presented and compared with experimental measurements. As a consequence, the limit of resolution with coherent illumination is extended by a factor of 1.64×.[MVD]Coherence and statistical optics : Coherent optical effectsImage processing : Phase retrievalImage processing : SuperresolutionImaging systems : MicroscopyHolography : Digital holographytext::journal::journal article::research article