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Proceedings Paper

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

Paper Details

Date Published: 20 September 2005
PDF: 7 pages
Proc. SPIE 5912, Operational Characteristics and Crystal Growth of Nonlinear Optical Materials II, 59120C (20 September 2005); doi: 10.1117/12.614406
Show Author Affiliations
Nandigana Krishna Mohan, Indian Institute of Technology Madras (India)


Published in SPIE Proceedings Vol. 5912:
Operational Characteristics and Crystal Growth of Nonlinear Optical Materials II
Ravindra B. Lal; Donald O. Frazier, Editor(s)

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