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Type: Artigo de periódico
Title: Fixed holograms in iron-doped lithium niobate: simultaneous self-stabilized recording and compensation
Author: Frejlich, J
de Oliveira, I
Arizmendi, L
Carrascosa, M
Abstract: We analyze the mechanisms leading to a highly diffractive fixed hologram in photorefractive Fe-doped lithium niobate crystals by simultaneous self-stabilized holographic recording and compensation at moderately high temperatures. We show that a partially compensated running hologram is produced during recording under this condition and discuss the performance of the process in terms of the operating temperature, the degree of oxidation ([Fe3+]/[Fe2+] ratio) of the sample, and the effect of the absorption grating arising from the spatial modulation of the Fe2+ concentration produced during photorefractive recording. We experimentally measure the evolution of the uncompensated remaining hologram during recording and the evolution of the diffraction efficiency of the fixed hologram during white-light development and show that the maximum fixed grating modulation to be achieved is roughly limited by Fe-dopant saturation. A reproducible eta approximate to 66% efficiency fixed grating was obtained on a sample exhibiting an otherwise maximum fixed eta approximate to 3% when using the classical three-step (recording at room temperature-compensating at high temperature-developing at room temperature) process. (c) 2007 Optical Society of America.
Country: EUA
Editor: Optical Soc Amer
Citation: Applied Optics. Optical Soc Amer, v. 46, n. 2, n. 227, n. 233, 2007.
Rights: aberto
Identifier DOI: 10.1364/AO.46.000227
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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