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Proceedings Paper

Characterization of incoherent-to-coherent optical conversion in DC-PVA plates
Author(s): Christophe De Veuster; Thierry Cornelissen; Yvon L. M. Renotte; Jean J.A. Couture; Yves F. Lion
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Paper Abstract

The conversion of incoherent-to-incoherent images by spatial light modulators (SLMs) enables optical information processing and computing applications. The conversion consists of recording an incoherent image and an optical modulation on the same photosensitive element. The coherent readout of the photosensitive element is suitable for processing. DC-PVA is a well-adapted material for incoherent-to-incoherent conversion because of its wide sensitivity spectrum and because it is self developing. Optimization of incoherent and coherent intensities and exposure times is preformed. The spatial frequency of the optical modulation is also optimized. The conversion process is characterized by diffractive efficiency and fringe visibility analysis. Effects on phase and amplitude gratings in the material are investigated. Different recording modes are tested: the grating erasure, the grating writing and the simultaneous erasure/writing. In the grating erasure mode the photosensitive material is first impressed with the optical modulation and then with the incoherent image. The grating writing mode is the opposite process. In the simultaneous grating erasure/writing mode the incoherent image and the optical modulation are capture together continuously or with multiple exposures in the DC-PVA plates. Replacing the incoherent beam with the coherent beam in the same geometric configuration performs a comparative characterization. Another characterization consists of comparing the converted image properties with the properties of an image produced by a direct coherent readout of an incoherent slide. Comparisons between incoherent-to- incoherent conversion of incoherently illuminated slides with collimated or divergent beams or incoherently illuminated objects are shown.

Paper Details

Date Published: 25 September 1998
PDF: 8 pages
Proc. SPIE 3417, Photopolymer Device Physics, Chemistry, and Applications IV, (25 September 1998); doi: 10.1117/12.323483
Show Author Affiliations
Christophe De Veuster, Univ. de Liege (Belgium)
Thierry Cornelissen, Univ. de Liege (Belgium)
Yvon L. M. Renotte, Univ. de Liege (Belgium)
Jean J.A. Couture, CEGEP de Beauce-Appalaches (Canada)
Yves F. Lion, Univ. de Liege (Belgium)

Published in SPIE Proceedings Vol. 3417:
Photopolymer Device Physics, Chemistry, and Applications IV
Roger A. Lessard, Editor(s)

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