Two-photon fluorescence measurements of reversible photodegradation in a dye-doped polymer

We report on the dynamics of photodegradation and subsequent recovery of two-photon fluorescence in a dye-doped polymer. The energy dependence suggests that photodegradation is a linear process, while recovery is entropic. Such recovery could be useful to high-intensity devices such as two-photon absorbers, which can be used in many applications. (c) 2007 Optical Society of America.