High thickness acrylamide photopolymer for peristrophic multiplexing

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Title: High thickness acrylamide photopolymer for peristrophic multiplexing
Authors: Ortuño, Manuel | Fernandez-Varo, Helena | Márquez, Andrés | Gallego, Sergi | Neipp, Cristian | 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
Keywords: Holography | Holographic recording materials | Photopolymers | Volume holograms | Multiplex holography
Knowledge Area: Óptica | Física Aplicada
Date Created: 2005
Issue Date: 9-Jun-2006
Publisher: SPIE, The International Society for Optical Engineering
Citation: ORUÑO SÁNCHEZ, Manuel, et al. "High thickness acrylamide photopolymer for peristrophic multiplexing". En: Holography 2005: International Conference on Holography, Optical Recording and Processing of Information : 21-25 May 1995, Varna, Bulgaria. Bellingham, Wash. : SPIE, 2006. (Proceedings of SPIE; Vol. 6252). ISBN 978-0-81946-311-1, 62520U-1/5
Abstract: The acrylamide photopolymers are considered interesting materials for holographic media. They have high diffraction efficiency (ratio of the intensities of the diffracted and the incident beams), an intermediate energetic sensitivity among other materials and post-processing steps are not necessary, therefore the media is not altered. The layers of these materials, about 1 mm thick, are a suitable media for recording many diffraction gratings in the same volume of photopolymer using peristrophic multiplexing technique, with great practical importance in the field of holographic memories type WORM (write once read many). In this work we study the recording of diffraction gratings by peristrophic multiplexing with axis of rotation perpendicular to the recording media. The photopolymer is composed of acrylamide as the polymerizable monomer, triethanolamine as radical generator, yellowish eosin as sensitizer and a binder of polyvinyl alcohol. We analyze the holographic behaviour of the material during recording and reconstruction of diffraction gratings using a continuous Nd:YAG laser (532 nm) at an intensity of 5 mW/cm2 as recording laser. The response of the material is monitored after recording with an He-Ne laser. We study the recording process of unslanted diffraction gratings of 1125 lines/mm. The diffraction efficiency of each hologram is seen to decrease as the number of holograms recorded increases, due to consumption of the available dynamic range, in a constant exposure scheduling. It can be seen that the photopolymer works well with high energy levels, without excessive dispersion of light by noise gratings. In order to homogenize the diffraction efficiency of each hologram we use the method proposed by Pu. This method is designed to share all or part of the avaliable dynamic range of the recording material among the holograms to be multiplexed. Using exposure schedules derived from this method we have used 3 scheduling recordings from the algorithm used. Additionaly, we use an exponential scheduling recording in order to correct the exposure times from the first iteration of the algorithm.
Sponsor: This work was supported by "Ministerio de Educación y Ciencia", Spain, under projects MAT2004-04881-C02-01 and MAT2004-04881-C02-01.
URI: http://hdl.handle.net/10045/9372
ISBN: 978-0-81946-311-1
ISSN: 0277-786X
DOI: 10.1117/12.677014
Language: eng
Type: info:eu-repo/semantics/article
Rights: Copyright 2006 Society of Photo-Optical Instrumentation Engineers. This paper was published in Proceedings of SPIE, vol. 6252, 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
Publisher version: http://dx.doi.org/10.1117/12.677014
Appears in Collections:INV - GHPO - Artículos de Revistas

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