Direct measurement of the dispersion of the electrogyration coefficient of photorefractive Bi12GeO20 crystals
Abstract
We report on the direct measurement of the electrogyration coefficient of Bi12GeO20 sillenite crystals over the visible spectral range. The coefficient is directly measured on a (111)-cut crystal for which the electro-optic and electrogyratory effects are decoupled. The precision of the measurement method over various parameters including absorption and misorientation is examined. The value of the electrogyration coefficient is found to vary from 0.37±0.03to0.05±0.01pm/V for the 460-760-nm spectrum range, which is within the upper boundaries that have been specified in previous experiments. It is also found that the electrogyration coefficient follows the dispersion law of optical activity and refractive index.
- Publication:
-
Journal of Applied Physics
- Pub Date:
- January 2005
- DOI:
- Bibcode:
- 2005JAP....97b3531D
- Keywords:
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- 42.70.Nq;
- 78.20.Jq;
- 78.20.Ek;
- 78.20.Ci;
- 78.40.Ha;
- Other nonlinear optical materials;
- photorefractive and semiconductor materials;
- Electrooptical effects;
- Optical activity;
- Optical constants;
- Other nonmetallic inorganics