Title of article :
Amplified spontaneous emission in polymethyl methacrylate doped with 3-(1,1-dicyanoethenyl)-1-phenyl-4,5-dihydro-1H-pyrazole (DCNP)
Author/Authors :
Sznitko، نويسنده , , L. and Mysliwiec، نويسنده , , J. and Parafiniuk، نويسنده , , K. and Szukalski، نويسنده , , A. and Palewska، نويسنده , , K. and Bartkiewicz، نويسنده , , S. and Miniewicz، نويسنده , , A.، نويسنده ,
Abstract :
Luminescence and amplified spontaneous emission (ASE) phenomenon of 3-(1,1-dicyanoethenyl)-1-phenyl-4,5-dihydro-1H-pyrazole (DCNP) dissolved in a polymethyl methacrylate (PMMA) matrix have been studied. We analyzed luminescence from thin films of DCNP–PMMA excited by the neodymium doped yttrium aluminum garnet (Nd:YAG) nanosecond pulsed laser doubled and tripled in frequency. We report on ASE in function of different excitation pulse energy densities (ASE threshold was estimated to be 10 and 13 mJ/cm2 for pumping beams wavelengths of 532 and 355 nm, respectively). We observed the photo-degradation process of a dye and performed exponential gain coefficient measurements (up to 10 cm−1) in the system.
