2-PHOTON PUMPED PARTIALLY CROSS-LINKED POLYMER LASER

Two-photon pumped (TPP) frequency-upconverted lasing properties of a p artially cross-linked fluorescent polymer are reported. This lasing me dium is a cross-linked homogeneous copolymer with tw o major compounds : the chromophore, 4-[bis (2-hydroxyethyl) amino]-N-methylstilbazolium iodide, and the monomer, 2-hydroxyethyl methacrylate. The spectral, t emporal, and spatial structures as well as the output/input characteri stics of the TPP cavity lasing were measured using a 13 mm long polyme r rod. The net conversion efficiency from the absorbed 1064 nm pump pu lse energy to the similar to 606 nm upconverted cavity lasing energy w as found to be similar to 4%. (C) 1997 American Institute of Physics.