Analysis of the phase conjugation reflectivity for volume speckle patterns in a BSO crystal

A. Salazar; Myrian C. Tebaldi; Nestor A. Bolognini

doi:10.1117/12.590629

21 October 2004 Analysis of the phase conjugation reflectivity for volume speckle patterns in a BSO crystal

A. Salazar, Myrian C. Tebaldi, Nestor A. Bolognini

Proceedings Volume 5622, 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications; (2004) https://doi.org/10.1117/12.590629
Event: 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications, 2004, Porlamar, Venezuela

Abstract

When a diffusing surface is illuminated by a coherent light beam, speckles are formed in the space in front of the surface. These speckles have a three-dimensional structure. However, in spite of this three-dimensional nature, two-dimensional recording media are usually used for applications in optical metrology. Since 80's, the photorefractive crystals were widely employed for optical processing and metrology in particular concerning speckle applications. Furthermore, we have taken advantage of the three-dimensional photorefractive medium to store three-dimensional speckle distributions. In our case, the phase conjugation theory, within the transmission grating approximation, is applied to study the phase conjugation reflectivity when speckle patterns are stored in a BSO photorefractive crystal. It is numerically shown that the beam coupling theory is adequate to explain the reflectivity behavior in terms of the average modulation of the registered speckles and the average speckle length. The knowledge of the reflectivity behavior when speckle patterns are considered, allows to optimize interferometric system based on real-time speckle pattern correlation and to improve speckle applications in optical signal processing.

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A. Salazar, Myrian C. Tebaldi, and Nestor A. Bolognini "Analysis of the phase conjugation reflectivity for volume speckle patterns in a BSO crystal", 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/10.1117/12.590629

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KEYWORDS

Speckle

Reflectivity

Crystals

Phase conjugation

Modulation

Speckle pattern

3D metrology

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