Study of speckle interferometry techniques in a photorefractive crystal BGO: conventional holography and double aperture

D. Caraballo L.; L. Maria del Carmen Lasprilla

doi:10.1117/12.591728

21 October 2004 Study of speckle interferometry techniques in a photorefractive crystal BGO: conventional holography and double aperture

D. Caraballo L., L. Maria del Carmen Lasprilla

Author Affiliations +

Proceedings Volume 5622, 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications; (2004) https://doi.org/10.1117/12.591728
Event: 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications, 2004, Porlamar, Venezuela

Abstract

The study of speckle patterns by photography or digitally have been used in a wide variety of events of measures of displacements, vibrations or small deformations, from almost static situations until high speeds. In this work, a comparative analysis of experimental arrangements of speckle techniques is presented: a conventional holography and double aperture, for micro displacements of objects, in both cases, the speckle is modulated by Young strips, of such form that the first case makes reference to a modulation to high frequency, and in the second case show a low frequency, also it is had in the two techniques it is made double-exposure, one for the starting point of the object and the other for the object displacement. The registration and the reading are carried out in almost-real time in holographic arrangements using a photorefractive crystal; the information in these crystals is codified like one variation local of refraction index. In the two cases it is considered the nature in volume by registers of the speckle. The contrast of the interference fringes is analyzed in terms of the diffraction efficiency of the readout beam and of the registration parameters. The results are presented for each configuration.

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D. Caraballo L. and L. Maria del Carmen Lasprilla "Study of speckle interferometry techniques in a photorefractive crystal BGO: conventional holography and double aperture", 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/10.1117/12.591728

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KEYWORDS

Crystals

Speckle

Holography

Modulation

Speckle pattern

Diffraction

Diffusers

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