Effect of piezoelectricity on the photorefractive gain in a bismuth silicate crystal

H. C. Ellin; Anders Grunnet-Jepsen; Laszlo Solymar; Jeno Takacs

doi:10.1117/12.182140

5 August 1994 Effect of piezoelectricity on the photorefractive gain in a bismuth silicate crystal

H. C. Ellin, Anders Grunnet-Jepsen, Laszlo Solymar, Jeno Takacs

Proceedings Volume 2321, Second International Conference on Optoelectronic Science and Engineering '94; (1994) https://doi.org/10.1117/12.182140
Event: Optoelectronic Science and Engineering '94: International Conference, 1994, Beijing, China

Abstract

The application of a voltage, V₀, across a photorefractive crystal in the presence of detuning is well known as a means of enhancing two-wave gain. By mounting a crystal of bismuth silicate, with faces cut parallel to the (001), (110) and (110) planes, in a rotating holder, measurements of two wave gain as a function of (theta) , the angle between the electric field vector E₀ (in the [001] direction) and the grating vector, K (in the (110) plane), have been made. Our results show that by having a non-zero value of (theta) the signal gain can be improved by a factor of two. Furthermore the experimental results showed that the (theta) dependent gain peaks differ in magnitude according to whether the crystal is rotated in an anti-clockwise or clockwise direction. In order to model the experimental results the steady-state expression for the space-charge field is extended to two dimensions and the usually neglected piezoelectric effect is included in the analysis of the modulation of the refractive index by the presence of this field inside the crystal. The asymmetry of the gain peaks is found to be caused by the optical activity of bismuth silicate and is predicted by the theory.

Citation Download Citation

H. C. Ellin, Anders Grunnet-Jepsen, Laszlo Solymar, and Jeno Takacs "Effect of piezoelectricity on the photorefractive gain in a bismuth silicate crystal", Proc. SPIE 2321, Second International Conference on Optoelectronic Science and Engineering '94, (5 August 1994); https://doi.org/10.1117/12.182140

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