By the z-scan method, we investigated the photobleaching processes of a non
linear optical polymer film made of poly (methyl methacrylate) with a dispe
rsed red (PMMA/DR1) side chain at the 488 nm wavelength of an argon ion las
er. It provides a simple method to determine the parameters in a bleaching
model that describes the polymer photobleaching processes. (C) 2000 Society
of Photo-Optical instrumentation Engineers. [S0091-3286(00)00311-1].