Artículos de revistas
Fixed holograms in iron-doped lithium niobate: simultaneous self-stabilized recording and compensation
Registro en:
Applied Optics. Optical Soc Amer, v. 46, n. 2, n. 227, n. 233, 2007.
1559-128X
2155-3165
WOS:000243283500013
10.1364/AO.46.000227
Autor
Frejlich, J
de Oliveira, I
Arizmendi, L
Carrascosa, M
Institución
Resumen
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. 46 2 227 233