Nanosecond laser operation by spectroscopical parameters of the oxadiazole derivatives

We have studied the variation of principal spectroscopic parameters (absorption edge, spectral positions of the first three principal bands, oscillator strengths) for three oxadiazoles (pyrazoloquinoline derivatives) with different state dipole moments incorporated into the polymethyl methacrylate (PMMA) polymer matrices in the 3% in weighting units. For investigations we have chosen three derivatives with different values of the state dipole moments. We have found that during illumination by 10 ns Nd-YAG laser beam with pulse duration about 10 ns, frequency repetition about 10 Hz and power density about 0.8–1.3 MW cm−2 the observed photoinduced changes red shifted for the three principal spectral bands situated at 330–350 nm; 450–500 nm and 525–550 nm. It was established that under influence of the pulsed Nd-YAG laser we observe substantial spectral shifts of the observed spectral maxima. The value of the shift is increased with decreased state dipole moment values.