García Llopis, Celia, Pascual, Inmaculada, Costela González, Ángel, García-Moreno Gonzalo, Inmaculada, Gómez Hernández, Clara, Fimia Gil, Antonio, Sastre Muñoz, Roberto
Hologram recording in polyvinyl alcohol/acrylamide photopolymers by means of pulsed laser exposure
GARCÍA LLOPIS, Celia, et al. “Hologram recording in polyvinyl alcohol/acrylamide photopolymers by means of pulsed laser exposure”. Applied Optics. Vol. 41, No. 14 (May 2002). ISSN 0003-6935, pp. 2613-2620
URI: http://hdl.handle.net/10045/9177
DOI: 10.1364/AO.41.002613
ISSN: 0003-6935 (Print)
Abstract: 
The variation in transmittance produced when a photopolymer is irradiated with a pulsed laser is analyzed and experimental results obtained when diffraction gratings are stored using pulsed exposure are presented. In either case, the influence of the energy of the irradiation pulse, the number of pulses, and the pulse repetition rate were studied. The photopolymer used was an acrylamide/polyvinyl alcohol dry film with a yellow eosin-thiethanol-amine mixture as a photoinitiator system. The recording of the gratings was performed by use of a holographic copying process. The samples were exposed and holograms recorded with a collimated beam from a frequency-doubled Nd:YAG (532 nm) Q-switched laser. Our initial results show that it is possible to obtain diffraction gratings with a diffraction efficiency of 60% and a refractive index modulation up to 2.8 × 10−3. The energetic sensitivities achieved are close to those obtained with the same material and continuous irradiation without a preprocessing of the gratings.
Keywords:Holography, Holographic recording materials, Optical storage materials, Photopolymers
Optical Society of America
info:eu-repo/semantics/article