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Proceedings Paper

Programmable amplitude apodizers in liquid crystal spatial light modulators
Author(s): Juan Campos; Maria Josefa Yzuel; Andres Marquez; Juan C. Escalera; Jeffrey A. Davis; Claudio C. Iemmi; Silvia A. Ledesma
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Paper Abstract

We show the feasibility of two new programmable diffractive optical elements (DOE). On one hand, we demonstrate the realization of programmable apodizers. With the term apodizer we refer to non-uniform amplitude filters used to modify the point-spread function (PSF) of an optical system. On the other hand, we show the simultaneous realization of a Fresnel lens and an amplitude filter in a single DOE: the programmable amplitude apodized Fresnel lens (PAAFL). Two different modulation regimes are required to generate these DOEs: amplitude-only regime for the programmable apodizer and phase-only regime for the PAAFL. We show that a twisted-nematic liquid crystal spatial light modulator (TN-LCSLM) inserted between two wave plates and two polarizers is able to provide both modulation regimes. Different types of amplitude filters, such as axial hyperresolving, transverse apodizing and transverse hyperresolving have been implemented both as programmable apodizers and as PAAFLs. We provide experimental results for the performance of the two new DOEs. The agreement with the numerical results is excellent, thus demonstrating the feasibility of our proposal.

Paper Details

Date Published: 8 November 2001
PDF: 12 pages
Proc. SPIE 4457, Spatial Light Modulators: Technology and Applications, (8 November 2001); doi: 10.1117/12.447743
Show Author Affiliations
Juan Campos, Univ. Autonoma de Barcelona (Spain)
Maria Josefa Yzuel, Univ. Autonoma de Barcelona (Spain)
Andres Marquez, Univ. Autonoma de Barcelona (Spain)
Juan C. Escalera, Univ. Autonoma de Barcelona (Spain)
Jeffrey A. Davis, San Diego State Univ. (United States)
Claudio C. Iemmi, Univ. de Buenos Aires (Argentina)
Silvia A. Ledesma, Univ. de Buenos Aires (Argentina)

Published in SPIE Proceedings Vol. 4457:
Spatial Light Modulators: Technology and Applications
Uzi Efron, Editor(s)

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