Change in Optical Path Length of Saturable Absorbing Dye-Doped Polymer Films under Laser Irradiation

Abstract

The cause of the change in the optical path length (nd) of the saturable absorbing dye-doped polymer films under laser irradiation is investigated using polyvinyl alcohol and gelatin films doped with erythrosin B. The temperature rise of the dye-doped films, the changes in optical path length, film thickness, the refractive index and the optical density of the dye-doped films are measured under laser irradiation. The thermal expansion due to the temperature rise of the dye-doped films caused by the irradiation has greater effect on the (nd) than the fading of dye molecules due to the irradiation of laser beams.