Feedback-controlled running holograms in strongly absorbing photorefractive materials

Citation
T. Frejlich et al., Feedback-controlled running holograms in strongly absorbing photorefractive materials, J OPT SOC B, 17(9), 2000, pp. 1517-1521
Citations number
12
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Optics & Acoustics
Journal title
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
ISSN journal
0740-3224 → ACNP
Volume
17
Issue
9
Year of publication
2000
Pages
1517 - 1521
Database
ISI
SICI code
0740-3224(200009)17:9<1517:FRHISA>2.0.ZU;2-A
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 si llenite crystals that usually exhibit a strong absorption effect. Fringe-lo cked experiments permit us to compute the quantum efficiency for the photog eneration of charge carriers in photorefractive crystals if the effect of b ulk absorption and the effective value of the externally applied field are adequately taken into consideration. A Bi12TiO20 sample was measured with t he 532-nm laser wavelength, and a quantum efficiency of Phi = 0.37 was obta ined. Disregarding absorption leads to large errors in Phi. (C) 2000 Optica l Society of America [S0740-3224(00)00209-5].