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Proceedings Paper

Use of spatial light modulators in wavefront coding for field imaging: adaptation of the filter design procedure
Author(s): Carme Ferran; Santiago Vallmitjana; Salvador Bosch
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Paper Abstract

Wavefront coding (WFC) is an imaging technique for enhancing some invariance capabilities of optical instruments (typically invariance against defocus). So far, the procedure has been mostly used in practical environments where the optical aberrations of the optical system correspond to a rotationally symmetrical one, i.e., on-axis imaging. These problems have been extensively tackled in recent years, leading to successful designs like the cubic and petal-shaped phase plates. An interesting aspect of the implementation of the phase plate is the use of a liquid crystal spatial light modulator (SLM) placed at the pupil of the instrument, since it allows enhanced versatility. Under these circumstances, the characteristics of the pupil phase plate, in order to provide invariance, refer only to spherical and defocus aberrations. However, when the optical system is not rotationally symmetrical, like for field imaging, the theoretical framework of the problem is quite different, as one has to deal with more general aberrations. Our aim is to analyze this field imaging invariance problem when using WFC techniques and to try to extend the well known on-axis techniques to this new application.

Paper Details

Date Published: 4 May 2010
PDF: 8 pages
Proc. SPIE 7723, Optics, Photonics, and Digital Technologies for Multimedia Applications, 772307 (4 May 2010); doi: 10.1117/12.854541
Show Author Affiliations
Carme Ferran, Univ. de Barcelona (Spain)
Santiago Vallmitjana, Univ. de Barcelona (Spain)
Salvador Bosch, Univ. de Barcelona (Spain)

Published in SPIE Proceedings Vol. 7723:
Optics, Photonics, and Digital Technologies for Multimedia Applications
Peter Schelkens; Touradj Ebrahimi; Gabriel Cristóbal; Frédéric Truchetet; Pasi Saarikko, Editor(s)

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