Programmable amplitude apodizers in liquid crystal spatial light modulators

Juan Campos; Maria Josefa Yzuel; Andres Marquez; Juan C. Escalera; Jeffrey A. Davis; Claudio C. Iemmi; Silvia A. Ledesma

doi:10.1117/12.447743

8 November 2001 Programmable amplitude apodizers in liquid crystal spatial light modulators

Juan Campos, Maria Josefa Yzuel, Andres Marquez, Juan C. Escalera, Jeffrey A. Davis, Claudio C. Iemmi, Silvia A. Ledesma

Author Affiliations +

Proceedings Volume 4457, Spatial Light Modulators: Technology and Applications; (2001) https://doi.org/10.1117/12.447743
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

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.

Citation Download Citation

Juan Campos, Maria Josefa Yzuel, Andres Marquez, Juan C. Escalera, Jeffrey A. Davis, Claudio C. Iemmi, and Silvia A. Ledesma "Programmable amplitude apodizers in liquid crystal spatial light modulators", Proc. SPIE 4457, Spatial Light Modulators: Technology and Applications, (8 November 2001); https://doi.org/10.1117/12.447743

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