Application of photorefractive crystals for holographic interferometry of vibrating diffuse specimens

Bruno F. Pouet; Sridhar Krishnaswamy

doi:10.1117/12.216849

18 August 1995 Application of photorefractive crystals for holographic interferometry of vibrating diffuse specimens

Bruno F. Pouet, Sridhar Krishnaswamy

Proceedings Volume 2622, Optical Engineering Midwest '95; (1995) https://doi.org/10.1117/12.216849
Event: Optical Engineering Midwest '95, 1995, Chicago, IL, United States

Abstract

Real-time interferometry of vibrating specimens is achieved using two-wave mixing in Bi₁₂SiO₂₀ (BSO). By using anisotropic self-diffraction in the photorefractive crystal, despite the small diffraction efficiency of the photorefractive grating, good fringe visibility and good singal to noise ratio are achieved by synchronizing the illumination with the CCD camera. In addition, the application of an external electric field is used to enhance the diffraction efficiency of the photorefractive grating. This greater efficiency makes possible the visualization of large diffusely scattering specimens. It is shown that the good SNR of the resulting holographic interferograms enables phase unwrapping which allows for quantitative deformation analysis. The performance of the photorefractive interferoemeter is compared with the performance of an electronic speckle pattern interferometer.

Citation Download Citation

Bruno F. Pouet and Sridhar Krishnaswamy "Application of photorefractive crystals for holographic interferometry of vibrating diffuse specimens", Proc. SPIE 2622, Optical Engineering Midwest '95, (18 August 1995); https://doi.org/10.1117/12.216849

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