Index of refraction, optical activity and electro-optic coefficient of bismuth titanium oxide (Bi12TiO20) |
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Authors: | DG Papazoglou AG Apostolidis ED Vanidhis |
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Institution: | (1) Aristotle University of Thessaloniki, Department of Physics-Solid State, Section 313-1, 540 06 Thessaloniki, Greece (Fax: +30-31/998019, E-mail: optlab@ccf.auth.gr), GR |
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Abstract: | 12 TiO20. The first two can be measured by simple and classical methods, but the coexistence of optical activity, electrogyration,
field-induced linear birefringence, and piezoelectric and photoelastic effects in photorefractive materials such as Bi12TiO20 complicate the measurement of the electro-optic coefficient. For normal incidence of linearly polarized light we derive analytic
expressions for the polarization of light that has passed through the crystal. The ellipticity of the polarization is a function
of the electric-field-induced linear birefringence and hence of the electro-optic coefficient of the crystal. Therefore measurement
of the ellipticity as a function of an electric field externally applied to the crystal leads to an electro-optic coefficient
r41 of 5.3±0.1 pm/V.
Received: 22 December 1996/Revised version: 21 March 1997 |
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Keywords: | PACS: 42 65 |
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