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

Jaime Frejlich; E. de Carvalho; Agnaldo A. Freschi; Jose Pedro Andreeta; Antonio Carlos Hernandes; Joao C. Carvalho; N. J. Heraldo Gallo

doi:10.1117/12.248640

23 August 1996 Stabilized holographic setup for the real-time continuous measurement of surface vibrational mode patterns

Jaime Frejlich, E. de Carvalho, Agnaldo A. Freschi, Jose Pedro Andreeta, Antonio Carlos Hernandes, Joao C. Carvalho, N. J. Heraldo Gallo

Author Affiliations +

Proceedings Volume 2868, Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1996) https://doi.org/10.1117/12.248640
Event: Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 1996, Ancona, Italy

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.

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Jaime Frejlich, E. de Carvalho, Agnaldo A. Freschi, Jose Pedro Andreeta, Antonio Carlos Hernandes, Joao C. Carvalho, and N. J. Heraldo Gallo "Stabilized holographic setup for the real-time continuous measurement of surface vibrational mode patterns", Proc. SPIE 2868, Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (23 August 1996); https://doi.org/10.1117/12.248640

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