2-PHOTON ABSORPTION BASED OPTICAL LIMITING AND STABILIZATION IN ORGANIC MOLECULE-DOPED SOLID MATERIALS

Optical limiting and stabilization via two-photon absorption (TPA) in organic molecule-doped solid materials have been investigated. The non linear materials are epoxy rod and a composite glass rod doped with th e same organic dopant (2,5-benzothiazole 3,4-didecyloxy thiophene). An ultrashort laser source with 0.5 ps pulsewidth and 602 nm wavelength was employed. The transmissivity of these two materials has been measu red as a function of the input beam intensity. The measured results ca n be well fitted based on the assumption that TPA is the predominant m echanism producing the observed optical limiting behavior. Also, optic al stabilization behavior is observed, and, at approximately 930 MW/cm 2 input intensity level, the output intensity fluctuation is three tim es less than the input intensity fluctuation.