Abstract

The alternating electric field technique is attractive as it can significantly enhance the two-beam coupling gain over that of a dc field alone. In this paper we study the ac field frequency influence on the photorefractive characteristics. A finite difference technique was employed to numerically solve the material equations. These predictions are compared with experimental results for BSO crystals. We examine the frequency dependence of the magnitude of the space charge field as well as the temporal fluctuations in amplitude and phase. The frequency dependent characteristics are also found to be influenced by the modulation index.

© 1992 Optical Society of America