TEMPORAL RESPONSE OF BARIUM-TITANATE TO SLOWLY OSCILLATING SIGNALS

Theoretical and experimental results are presented which demonstrate t hat slowly oscillating signals experience a temporal delay in photoref ractive two beam coupling experiments. This delay corresponds to the r esponse time of the signal. It is determined to be dependent on the fr equency of the oscillating input signal. In the limit of low frequenci es, the response time is given by the product of the space charge fiel d response time and the gain. As the frequency increases, the response time decreases. For high enough frequencies, response times faster th an the space charge field response time are predicted and experimental ly observed. (C) 1998 Elsevier Science B.V. All rights reserved.