High-efficiency volume holograms recording on acrylamide and N,N'methylene-bis-acrylamide photopolymer with pulsed laser

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Title: High-efficiency volume holograms recording on acrylamide and N,N'methylene-bis-acrylamide photopolymer with pulsed laser
Authors: Gallego, Sergi | Ortuño, Manuel | García Llopis, Celia | 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
Keywords: Holography | Holographic recording materials | Volume holograms | Photopolymers | Pulsed laser
Knowledge Area: Óptica | Física Aplicada
Date Created: 2-Apr-2004
Issue Date: Jul-2005
Publisher: Taylor & Francis
Citation: GALLEGO RICO, Sergi, et al. “High-efficiency volume holograms recording on acrylamide and N,N'methylene-bis-acrylamide photopolymer with pulsed laser”. Journal of Modern Optics. Vol. 52, No. 11 (July 2005). ISSN 0950-0340, pp. 1575-1584
Abstract: In order to achieve a better understanding of the mechanisms of hologram formation and higher diffraction efficiencies in volume gratings stored in acrylamide based photopolymers, a crosslinker (N,N'methylene-bis-acrylamide) has been incorporated in the photopolymer to record holograms by pulsed laser exposure. The presence of this component increases the polymerization rate and refractive index modulation. The recording was performed using a holographic copying process. The original was a grating of 1000 lines/mm processed using silver halide sensitized gelatin. First, the effect of the pulse fluence was investigated. When the pulse fluence was optimized, the results obtained using the new composition of material were compared with those using the composition without a crosslinker. Using a pulsed laser at 532 nm the photopolymer without crosslinker presented diffraction efficiencies slightly less than 60%. On the other hand, when the crosslinker was introduced in the photopolymer composition, the diffraction efficiencies achieved were higher than 85%. The non-linearity of the material's response was also studied comparing the energetic sensitivity, diffraction efficiencies and index modulation of gratings recorded with pulsed and continuous laser exposure. This study was performed fitting the angular scan of each grating using Kogelnik's theory.
Sponsor: This work was partially financed by the ‘Conselleria d’Empresa Universitat i Ciència’ (Generalitat Valenciana, Spain) under project GV04A/565 and the ‘Vicerrectorado de Investigación’ (Universidad de Alicante, Spain) under projects GRE04-06 and GRE04-16.
URI: http://hdl.handle.net/10045/9338
ISSN: 0950-0340 (Print) | 1362-3044 (Online)
DOI: 10.1080/09500340500058157
Language: eng
Type: info:eu-repo/semantics/article
Rights: This is an electronic version of an article published in the Journal of Modern Optics ©2005 Copyright Taylor & Francis; Journal of Modern Optics is available online at http://www.informaworld.com
Peer Review: si
Publisher version: http://dx.doi.org/10.1080/09500340500058157
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