Scientific Results

Phase map retrieval in digital holography: avoiding the undersampling effect by a lateral shear approach

Year: 2007

Authors: Ferraro P., Del Core C., Miccio L., Grilli S., De Nicola S., Finizio A., Coppola G.

Autors Affiliation: CNR – Istituto Nazionale di Ottica Applicata and LENS European Laboratory for Non-Linear Spectroscopy, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy;
Istituto di Cibernetica “E. Caianiello” del CNR, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy;
CNR – Istituto per la Microelettronica e i Microsistemi, Via P. Castellino 111, 80131, Napoli, Italy

Abstract: In digital holography (DH) the numerical reconstruction of the whole wavefront allows one to extract the wrapped phase map mod, 2 pi. It can occur that the reconstructed wrapped phase map in the image plane is undersampled because of the limited pixel size in that plane. In such a case the phase distribution cannot be retrieved correctly by the usual unwrapping procedures. We show that the use of the digital lateral-shearing interferometry approach in DH provides the correct reconstruction of the phase map in the image plane, even in extreme cases where the phase profile changes very rapidly. We demonstrate the effectiveness of the method in a particular case where the profile of a highly curved silicon microelectromechanical system membrane has to be reconstructed. (c) 2007 Optical Society of America.

Journal/Review: OPTICS LETTERS

Volume: 32 (15)      Pages from: 2233  to: 2235

KeyWords: digital holography
DOI: 10.1364/OL.32.002233

Citations: 28
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