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Optical characterization of organic nonlinear optical crystals irradiated with MeV protons: an electron paramagnetic resonance study

In processes of obtaining a new NLO materials, modifying and enhancing the existing materials, various aromatic compounds were synthesized with the intent of comparing their nonlinear optical properties. Different techniques were used to characterize the proton-irradiated N-isobutyl-4-methyl-6- nitro-2-quinolinamine sample. From the electron paramagnetic resonance measurements; the spin concentration seemed to increase significantly when the proton beam increased from 0 to 2.2 Mev and then the spin concentration starts decreasing up to 3 Mev. The EPR signal for N-isobutyl was singlet up to 1.8 Mev then split into duplet around 2 Mev. Then EPR signal for N-isobutyl was singlet up to 1.8 Mev-irradiated-sample. FTIR analysis also shows a dramatic increase in transmission in different bands of the spectra. Due to higher energy proton irradiation, a high significant improvement in the nonlinear characteristics of the sample was observed. A theoretical interpretation for the effect of the proton irradiation enhancement of the nonlinearity of these will be presented as well.