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Proceedings Paper

Stabilized holographic setup for the real-time continuous measurement of surface vibrational mode patterns
Author(s): Jaime Frejlich; E. de Carvalho; Agnaldo A. Freschi; Jose Pedro Andreeta; Antonio Carlos Hernandes; Joao C. Carvalho; N. J. Heraldo Gallo
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Paper Abstract

We report the operation and performance of a time-averaged holographic interferometry setup for the measurement of vibrational mode patterns in a surface, using the He-Ne laser 632.8 nm wavelength line and a photorefractive Bi12TiO20 crystal as the recording medium. The photorefractive crystal allows the real-time reversible recording and display of the hologram without any (chemical or thermal) development processing. The particular light polarization features of this sillenite family crystal allow the display of vibrational mode patterns and at the same time enable to actively stabilize the holographic setup. Good quality images are obtained even using low power laser beams requiring a long exposure time in comparatively perturbated environment.

Paper Details

Date Published: 23 August 1996
PDF: 11 pages
Proc. SPIE 2868, Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (23 August 1996); doi: 10.1117/12.248640
Show Author Affiliations
Jaime Frejlich, Univ. Estadual de Campinas (Brazil)
E. de Carvalho, Univ. Estadual de Campinas (Brazil)
Agnaldo A. Freschi, Univ. Estadual de Campinas (Brazil)
Jose Pedro Andreeta, Univ. de Sao Paulo (Brazil)
Antonio Carlos Hernandes, Univ. de Sao Paulo (Brazil)
Joao C. Carvalho, Univ. de Sao Paulo (Brazil)
N. J. Heraldo Gallo, Univ. de Sao Paulo (Brazil)

Published in SPIE Proceedings Vol. 2868:
Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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