Stabilized holographic setup for the real-time continuous measurement of surface vibrational mode patterns

Frejlich, Jaime; de Carvalho, E.; Freschi, Agnaldo A.; Andreeta, Jose P.; Hernandes, Antonio C.; Carvalho, Joao C.; Gallo, N. J. H.

doi:doi:10.1117/12.248640

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Proceedings / Volume 2868 / Holography I

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Stabilized holographic setup for the real-time continuous measurement of surface vibrational mode patterns

Proc. SPIE 2868, 205 (1996); http://dx.doi.org/10.1117/12.248640

Monday 23 September 1996

Ancona, Italy

Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications

Enrico P. Tomasini

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Abstract

Jaime Frejlich, E. de Carvalho, and Agnaldo A. Freschi

Univ. Estadual de Campinas (Brazil)

Jose P. Andreeta, Antonio C. Hernandes, Joao C. Carvalho, and N. J. H. Gallo

Univ. de Sao Paulo (Brazil)

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.

History

Online May 12, 2005

Digital Object Identifier

http://dx.doi.org/10.1117/12.248640

Citation

Jaime Frejlich, E. de Carvalho, Agnaldo A. Freschi, Jose P. Andreeta, Antonio C. Hernandes, Joao C. Carvalho and N. J. H. Gallo, "Stabilized holographic setup for the real-time continuous measurement of surface vibrational mode patterns", Proc. SPIE 2868, 205 (1996); http://dx.doi.org/10.1117/12.248640