Influence of the set-up on the recording of diffractive optical elements into photopolymers

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Title: Influence of the set-up on the recording of diffractive optical elements into photopolymers
Authors: Gallego, Sergi | Fernandez, Roberto | Márquez, Andrés | Neipp, Cristian | Beléndez, Augusto | Pascual, Inmaculada
Research Group/s: Holografía y Procesado Óptico
Center, Department or Service: Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal | Universidad de Alicante. Departamento de Óptica, Farmacología y Anatomía | Universidad de Alicante. Instituto Universitario de Física Aplicada a las Ciencias y las Tecnologías
Keywords: Diffractive optical elements | Holography | Holographic recording materials | Photopolymers | Spatial light modulators
Knowledge Area: Óptica | Física Aplicada
Date Created: Mar-2014
Issue Date: 1-May-2014
Publisher: SPIE, The International Society for Optics and Photonics
Citation: S. Gallego ; R. Fernández ; A. Márquez ; C. Neipp ; A. Beléndez ; I. Pascual; Influence of the set-up on the recording of diffractive optical elements into photopolymers. Proc. SPIE 9131, Optical Modelling and Design III, 91311H (May 1, 2014); doi:10.1117/12.2051709
Abstract: Photopolymers are often used as a base of holographic memories displays. Recently the capacity of photopolymers to record diffractive optical elements (DOE’s) has been demonstrated. To fabricate diffractive optical elements we use a hybrid setup that is composed by three different parts: LCD, optical system and the recording material. The DOE pattern is introduced by a liquid crystal display (LCD) working in the amplitude only mode to work as a master to project optically the DOE onto the recording material. The main advantage of this display is that permit us modify the DOE automatically, we use the electronics of the video projector to send the voltage to the pixels of the LCD. The LCD is used in the amplitude-mostly modulation regime by proper orientation of the external polarizers (P); then the pattern is imaged onto the material with an increased spatial frequency (a demagnifying factor of 2) by the optical system. The use of the LCD allows us to change DOE recorded in the photopolymer without moving any mechanical part of the set-up. A diaphragm is placed in the focal plane of the relay lens so as to eliminate the diffraction orders produced by the pixelation of the LCD. It can be expected that the final pattern imaged onto the recording material will be low filtered due to the finite aperture of the imaging system and especially due to the filtering process produced by the diaphragm. In this work we analyze the effect of the visibility achieved with the LCD and the high frequency cut-off due to the diaphragm in the final DOE recorded into the photopolymer. To simulate the recording we have used the fitted values parameters obtained for PVA/AA based photopolymers and the 3 dimensional models presented in previous works.
Sponsor: This work was supported by the Ministerio de Economía y Competitividad of Spain under projects FIS2011-29803-C02-01 and FIS2011-29803-C02-02 and by the Generalitat Valenciana of Spain under project PROMETEO/2011/021 and ISIC/2012/013.
ISBN: 9781628410792
ISSN: 0277-786X
DOI: 10.1117/12.2051709
Language: eng
Type: info:eu-repo/semantics/article
Rights: Copyright 2014 Society of Photo-Optical Instrumentation Engineers. This paper was published in Proceedings of SPIE, vol. 9131, and is made available as an electronic reprint with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Peer Review: si
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