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

Abdalla M. Darwish; Tommy Thompson; Alton Williams; Kamala N. Bhat; James M. Thompson; Kelly Chelette; Shane LaFitte; Wayne Hyde; Gary White; Gary A. Glass; Yongqiang Wang

doi:10.1117/12.326854

9 October 1998 Optical characterization of organic nonlinear optical crystals irradiated with MeV protons: an electron paramagnetic resonance study

Abdalla M. Darwish, Tommy Thompson, Alton Williams, Kamala N. Bhat, James M. Thompson, Kelly Chelette, Shane LaFitte, Wayne Hyde, Gary White, Gary A. Glass, Yongqiang Wang

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Proceedings Volume 3470, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications IV; (1998) https://doi.org/10.1117/12.326854
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

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.

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Abdalla M. Darwish, Tommy Thompson, Alton Williams, Kamala N. Bhat, James M. Thompson, Kelly Chelette, Shane LaFitte, Wayne Hyde, Gary White, Gary A. Glass, and Yongqiang Wang "Optical characterization of organic nonlinear optical crystals irradiated with MeV protons: an electron paramagnetic resonance study", Proc. SPIE 3470, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications IV, (9 October 1998); https://doi.org/10.1117/12.326854

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KEYWORDS

Nonlinear crystals

FT-IR spectroscopy

Nonlinear optics

Signal processing

Crystals

Second-harmonic generation

Analytical research

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