Reflective grating interferometer in a noncollimated configuration

Year: 2000

Authors: Ferraro P., De Nicola S., Finizio A., Pierattini G.

Autors Affiliation: Istituto di Cibernetica del CNR , Arco Felice, Via Toiano 6, 800072. Italy;
Istituto nazionale di Ottica Applucata, Sez. di Napoli, Napoli, Italy

Abstract: A third-order aberration analysis for a reflective grating interferometer (RGI) is developed for a noncollimated configuration. In such a configuration the RGI is still a folded and reversing interferometer that is sensitive only to coma aberration, as it is in the collimated configuration. However, for an unaberrated input beam converging on a plane grating, the reflective grating of the interferometer introduces self-aberrations. Consequently, a nonnull fringe pattern is obtained. Nevertheless, a RGI in the noncollimated configuration has the potential to be applied for isolating and measuring coma, and a possible configuration for this application is proposed. As an example of the application, the coma of a large mirror could be isolated and measured by use of a converged configuration to avoid the main limitation in using the RGI in a configuration with a nearly collimated beam. (C) 2000 Optical Society of America.

Journal/Review: APPLIED OPTICS

Volume: 39 (13)      Pages from: 2116  to: 2121

KeyWords: reflective grating interferometer
DOI: 10.1364/AO.39.002116

Citations: 8
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