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Charge transfer and the photosensitivity in single- and double-doped LiNbO3 single crystals; an optical-electron paramagnetic resonance study: II
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Paper Abstract

Transition metals in particular increase the photorefractive sensitivity. We have reported in part I of the observed enhancement for the nonlinearity of these crystals due to the single and doubly dopants. In this part, we tried to answer some of the questions about the enhancement of the photorefractive sensitivity due to gamma irradiation. The crystals were irradiated by gamma ray and the EPR spectra were obtained. A new EPR center was observed at 3420G in Mn:Fe:LiNbO3 crystals. The Degenerate four wave mixing experiment was performed for these crystals and we have observed that the intensity of the PC signal from Ni:LiNbO3 crystal was increased by almost 30 percent. By applying the Ar+ laser in situ the EPR signal was decreased and the center was bleached after almost nine minutes in the case of LiNbO3:Ni and four minutes in the case of LiNbO3:Fe:Mn crystal. An interpretation for this phenomenon will be given on the light of Kuktarev model.

Paper Details

Date Published: 9 October 1998
PDF: 8 pages
Proc. SPIE 3470, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications IV, (9 October 1998);
Show Author Affiliations
Abdalla M. Darwish, Alabama A&M Univ. and Laser-Matter Research Labs. (United States)
Mohan D. Aggarwal, Alabama A&M Univ. (United States)
J. Morris, Alabama A&M Univ. (United States)
JaChing Wang, Alabama A&M Univ. (United States)
Partha P. Banerjee, Univ. of Alabama in Huntsville (United States)
Deanna K. McMillen, U.S. Army Missile Command (United States)
Tracy Dean Hudson, U.S. Army Missile Command (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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