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Type: Artigo de periódico
Title: Feedback-controlled running holograms in strongly absorbing photorefractive materials
Author: Frejlich, J
Freschi, AA
Garcia, PM
Shamonina, E
Gayvoronsky, VY
Ringhofer, KH
Abstract: We propose a mathematical model for the movement in absorbing materials of photorefractive holograms under feedback constraints. We use this model to analyze the speed of a fringe-locked running hologram in photorefractive sillenite crystals that usually exhibit a strong absorption effect. Fringe-locked experiments permit us to compute the quantum efficiency for the photogeneration of charge carriers in photorefractive crystals if the effect of bulk absorption and the effective value of the externally applied field are adequately taken into consideration. A Bi12TiO20 sample was measured with the 532-nm laser wavelength, and a quantum efficiency of Phi = 0.37 was obtained. Disregarding absorption leads to large errors in Phi. (C) 2000 Optical Society of America [S0740-3224(00)00209-5].
Country: EUA
Editor: Optical Soc Amer
Citation: Journal Of The Optical Society Of America B-optical Physics. Optical Soc Amer, v. 17, n. 9, n. 1517, n. 1521, 2000.
Rights: aberto
Identifier DOI: 10.1364/JOSAB.17.001517
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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