Determination of the electro-optic coefficient of Bi12TiO20 photorefractive crystals using the laser light self-diffraction

Mariana Petris; Valentin I. Vlad; Ileana Apostol

doi:10.1117/12.203555

8 March 1995 Determination of the electro-optic coefficient of Bi₁₂TiO₂₀ photorefractive crystals using the laser light self-diffraction

Mariana Petris, Valentin I. Vlad, Ileana Apostol

Author Affiliations +

Proceedings Volume 2461, ROMOPTO '94: Fourth Conference in Optics; (1995) https://doi.org/10.1117/12.203555
Event: ROMOPTO '94: 4th Conference on Optics, 1994, Bucharest, Romania

Abstract

In this paper, we report an all-optical method for the determination of the electro-optic coefficient of the photorefractive crystals. Two laser beams with the wavelength (lambda) equals 632.8 nm interfere in a Bi₁₂TiO₂₀ (BTO) crystal, inducing a phase grating on which they are self-diffracting. The photoinduced space-charge field is anharmonic as a consequence of the high contrast of the incident light fringe pattern imposed by the condition of large diffraction efficiency. Our analytical evaluation of the light intensity in the diffraction orders (in the Raman-Nath regime) and processing of the experimental results led to the determination of the electro-optic coefficient, r. The values of the electro-optic coefficient, obtained for different BTO crystal samples, are in agreement with those reported in literature and obtained by electro-optical methods.

Citation Download Citation

Mariana Petris, Valentin I. Vlad, and Ileana Apostol "Determination of the electro-optic coefficient of Bi₁₂TiO₂₀ photorefractive crystals using the laser light self-diffraction", Proc. SPIE 2461, ROMOPTO '94: Fourth Conference in Optics, (8 March 1995); https://doi.org/10.1117/12.203555

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