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Proceedings Paper

Photorefractive speckle pattern amplification
Author(s): Myrian C. Tebaldi; Nestor A. Bolognini; L. Arizmendi
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Paper Abstract

Photorefractive crystals make possible an efficient energy transfer from the pump beam (reference) into the signal beam. The coupling of interacting beams in dynamic hologram recording in photorefractive media can be utilized to produce an image amplification whose action is based on a light-induced change of the refractive index. A speckle distribution is characterized by a randomly varying intensity and phase. In our case, we consider a speckle distribution and a plane wave as the interfering beams inside a BSO crystal. The incident beam ratio of the two interfering beam depends on the speckle beam intensities and an statistical distribution of the beam ratio appears in the crystal. Under this condition, the speckle amplification is analyzed. When the reference beam is phase shifted, a local amplification is observed in the reconstructed speckle beam. The amplification is studied in terms of the input mean intensity of the speckle beam, the pupil aperture diameter of the imaging lens and the external applied voltage.

Paper Details

Date Published: 21 October 2004
PDF: 6 pages
Proc. SPIE 5622, 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications, (21 October 2004); doi: 10.1117/12.591674
Show Author Affiliations
Myrian C. Tebaldi, CIOp (Argentina)
Univ. Nacional de La Plata (Argentina)
Nestor A. Bolognini, CIOp (Argentina)
Univ. Nacional de La Plata (Argentina)
L. Arizmendi, Univ. Autonoma de Madrid (Spain)

Published in SPIE Proceedings Vol. 5622:
5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications
Aristides Marcano O.; Jose Luis Paz, Editor(s)

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