Amplified spontaneous emission of 3-(1,1-dicyanoethenyl)-1-phenyl-4,5-dihydro-1H-pyrazole molecule embedded in various polymer matrices

Results of studies on the amplified spontaneous emission (ASE) phenomenon in 3-(1,1-dicyanoethenyl)-1-phenyl-4,5-dihydro-1H-pyrazole (DCNP) molecules in four different polymeric matrices are reported. We have analyzed ASE spectra coming from thin films of DCNP-matrix samples when excited by the Nd:YAG nanosecond pulsed laser doubled in frequency (λ = 532 nm). We report on ASE characteristics in function of different excitation pulse energy densities evaluating ASE thresholds, exponential gain coefficients and reporting the influence of the specific matrix–dye interactions on the photo-degradation process of the dye.

► Amplified spontaneous emission of DCNP compound doped to different polymeric matrices has been measured.
► Exponential gain coefficients has been estimated using Shank technique for different matrices.
► The PMMA matrix has shown very good temporal photostability, over 30,000 pulses.
► For the PVK matrix the threshold of the amplified spontaneous emission was the lowest.
► The emission properties DCNP compound in PMMA matrix are due to the process of dopant recrystallization.