Investigations on the grating dynamics in a fast photorefractive guest-host polymer

Holographic studies of a new guest-host system based on a highly photocondu cting fluorene-triarylamine copolymer are presented. The photorefractive gr ating dynamics are investigated in detail. We propose a new approach to cha racterize the temporal behavior of these processes. By performing an invers e Laplace transform analysis using the algorithm CONTIN, we were able to id entify several processes and to evaluate the according time constants. We c ompare this method with a conventional procedure to prove its applicability . Both approaches yield almost identical results for the fast time constant which is down to 1 ms for this material at a writing beam intensity of I-w b = 1.44 W/cm(2). (C) 1999 Elsevier Science B.V, All rights reserved.