Phase-shifting dynamic holographic interferometry using BSO photorefractive crystals

Bruno F. Pouet; Sridhar Krishnaswamy

doi:10.1117/12.269808

20 March 1997 Phase-shifting dynamic holographic interferometry using BSO photorefractive crystals

Bruno F. Pouet, Sridhar Krishnaswamy

Proceedings Volume 2921, International Conference on Experimental Mechanics: Advances and Applications; (1997) https://doi.org/10.1117/12.269808
Event: International Conference on Experimental Mechanics: Advances and Applications, 1996, Singapore, Singapore

Abstract

Holographic interferometry of phase objects as well as diffusely scattering opaque specimens is achieved in quasi real-time using two-wave mixing in photorefractive Bi₁₂SiO₂₀ (BSO) crystals. In the case of diffusely scattering specimens, phase shifting holographic interferometry of a vibrating plate specimen is done by recording at least 3 double pulse holograms with different phase shifts of the reference beam. The good signal-to-noise ratio and resolution of the resulting holographic interferograms enable phase measurement of complex vibration modes. Quasi-heterodyne interferometry is also demonstrated for phase objects under non-recurring loading. A double exposure hologram with two separate reference beams at different incident angles for the two exposures is recorded in a BSO crystal. The two recorded object states are subsequently reconstructed by the reference beams at any desired phase by simply introducing a relative phase shift between the two readout reference beams. Because of the speed of the photorefractive effect and the lack of need for post processing, such a recording material allows image acquisition comparable in temporal resolution to electronic speckle techniques with the image quality of classical holography.

Citation Download Citation

Bruno F. Pouet and Sridhar Krishnaswamy "Phase-shifting dynamic holographic interferometry using BSO photorefractive crystals", Proc. SPIE 2921, International Conference on Experimental Mechanics: Advances and Applications, (20 March 1997); https://doi.org/10.1117/12.269808

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KEYWORDS

Crystals

Holograms

Holographic interferometry

Phase shifts

Holography

Signal to noise ratio

Diffraction

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