Photorefractive speckle pattern amplification

Myrian C. Tebaldi; Nestor A. Bolognini; L. Arizmendi

doi:10.1117/12.591674

21 October 2004 Photorefractive speckle pattern amplification

Myrian C. Tebaldi, Nestor A. Bolognini, L. Arizmendi

Proceedings Volume 5622, 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications; (2004) https://doi.org/10.1117/12.591674
Event: 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications, 2004, Porlamar, Venezuela

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.

Citation Download Citation

Myrian C. Tebaldi, Nestor A. Bolognini, and L. Arizmendi "Photorefractive speckle pattern amplification", Proc. SPIE 5622, 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications, (21 October 2004); https://doi.org/10.1117/12.591674

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KEYWORDS

Speckle

Crystals

Modulation

Laser crystals

Speckle pattern

Mirrors

Phase shifts

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