A real time phase reversal read-out system with BaTiO3 crystal as a recording medium for speckle fringe analysis

Nandigana Krishna Mohan

doi:10.1117/12.614406

20 September 2005 A real time phase reversal read-out system with BaTiO₃ crystal as a recording medium for speckle fringe analysis

Nandigana Krishna Mohan

Author Affiliations +

Proceedings Volume 5912, Operational Characteristics and Crystal Growth of Nonlinear Optical Materials II; 59120C (2005) https://doi.org/10.1117/12.614406
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

A real-time phase reversal speckle photography system using BaTiO₃ crystal as a recording medium is developed for phase step calibration. A pi-phase shift on the random speckle pattern is accomplished by varying pressure within an air-filled quartz cell inserted in the pump beam in a two-beam coupling arrangement It is shown that phase reversal can be achieved when a pi-shifted speckle pattern overlaps on an un-shifted speckle pattern at the observation plane in real-time, results in, destructive interference between the two speckle patterns. This phenomenon is exploited for calibration of the phase shifter. A four frame phase shifting technique is used, and the experimental whole field speckle fringe analysis carried out on a diffuse surface subjected to rotation in its own plane is presented.

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Nandigana Krishna Mohan "A real time phase reversal read-out system with BaTiO₃ crystal as a recording medium for speckle fringe analysis", Proc. SPIE 5912, Operational Characteristics and Crystal Growth of Nonlinear Optical Materials II, 59120C (20 September 2005); https://doi.org/10.1117/12.614406

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KEYWORDS

Speckle

Phase shifts

Crystals

Fringe analysis

Photography

Calibration

Speckle pattern

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