García Llopis, Celia, Costela González, Ángel, Fimia Gil, Antonio, García-Moreno Gonzalo, Inmaculada, Pascual, Inmaculada, Sastre Muñoz, Roberto
Recording of diffraction gratings in polyvinyl alcohol/acrylamide photopolymers by pulsed laser irradiation
GARCÍA LLOPIS, Celia, et al. "Recording of diffraction gratings in polyvinyl alcohol/acrylamide photopolymers by pulsed laser irradiation". En: Practical holography XV and holographic materials VII : 22-23 January 2001, San Jose, California. Bellingham, Wash. : SPIE, 2001. (Proceedings of SPIE; Vol. 4296). ISBN 978-0-81943-974-1, pp. 274-281
URI: http://hdl.handle.net/10045/9379
DOI: 10.1117/12.429469
ISSN: 0277-786X
ISBN: 978-0-81943-974-1
Abstract: 
In this paper we present the experimental results obtained when diffraction gratings are stored using pulsed exposure in polyvinyl alcohol/acrylamide photopolymer deposited in a dry film. The influence of the energy of the irradiation pulse was studied and the number of pulses needed to reach maximum diffraction efficiency was obtained. The recording was performed using a n holographic copying process. The original patten employed was a gratin of 1000 lines/mm processed according to sliver halide sensitized gelatin, with a beam ratio of 1:2 and transmittance of 75 percent. We exposed the samples by recording holograms with as collimated beam from a frequency-doubled Nd:YAG Q- switched laser. The pulse duration was approximately 8 ns and the frequency of repetition varied between 2 and 10 Hz. The pulse fluence was increased from 0.07 mJ/cm2 to 6.7 mJ/cm2. Our initial results show that it is possible to obtain diffraction gratings with a diffraction efficiency of 60 percent. The energetic sensitivities achieved are close to those obtained when working with the same material and continuous irradiation, without processing of the gratings.
Keywords:Holography, Holographic recording materials, Photopolymers, Diffraction gratings, Pulsed laser
SPIE, The International Society for Optical Engineering
info:eu-repo/semantics/article