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Proceedings Paper

Optical characterization of organic nonlinear optical crystals irradiated with MeV protons: an electron paramagnetic resonance study
Author(s): 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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Paper 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.

Paper Details

Date Published: 9 October 1998
PDF: 10 pages
Proc. SPIE 3470, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications IV, (9 October 1998); doi: 10.1117/12.326854
Show Author Affiliations
Abdalla M. Darwish, Alabama A&M Univ. and Laser-Matter Research Labs. (United States)
Tommy Thompson, NASA Marshall Space Flight Ctr. (United States)
Alton Williams, Alabama A&M Univ. (United States)
Kamala N. Bhat, Alabama A&M Univ. (United States)
James M. Thompson, Alabama A&M Univ. (United States)
Kelly Chelette, Northwestern State Univ. (United States)
Shane LaFitte, Northwestern State Univ. (United States)
Wayne Hyde, Northwestern State Univ. (United States)
Gary White, Northwestern State Univ. (United States)
Gary A. Glass, Univ. of Southwestern Louisiana (United States)
Yongqiang Wang, Univ. of Southwestern Louisiana (United States)


Published in SPIE Proceedings Vol. 3470:
Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications IV
Francis T. S. Yu; Shizhuo Yin, Editor(s)

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