INTERNAL PHOTOSTABILIZATION OF POLYMERIC SOLID-STATE DYE-LASERS BASEDON TRICHROMOPHORIC RHODAMINE 6G MOLECULES

We report on the lasing action of a modified rhodamine 6G dye with two covalently bonded identical 1,8-naphthalimide groups in liquid soluti on in ethanol and in solid solutions in a methacrylate copolymer. When the solid samples are transversely pumped with 534 nm pulses at a rep etition rate of 1 Hz, we have observed that the presence of the naphth alimide groups results in a clear photostabilization of the material. Possible mechanisms for the photostabilization process are suggested. (C) 1997 Elsevier Science B.V.