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Proceedings Paper

Photoinduced charge transfer in BSO:Cr3+ homegrown single crystal at room temperature during grating formation under Ar+ laser illumination in EPR experiment
Author(s): Abdalla M. Darwish; R. Sliz; Robert R. Copeland; Putcha Venkateswarlu; Jaeho Choi; Robert Metzl; Wen Shan Wang; Mohan D. Aggarwal; Alton Williams
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Paper Abstract

With a view to understand the microscopic origin of photoinduced charge transfer in the cubic BSO crystal, we have studied the EPR spectrum of BSO:Fe3+ and the effect of laser illumination on the EPR signal during photorefractive grating formation at liquid nitrogen and room temperatures. The BSO:Cr crystal was grown at Alabama A&M University using Czochralski technique and the EPR spectrum was recorded at room temperature. Three EPR signals were observed. The EPR signals are due to the main dopant Cr3+ and the weak presence of Fe3+ which is inherent in BSO crystal. The effect of Ar+ laser illumination revealed new facts about the behavior of Cr3+ under laser illumination which is opposite to the behavior of Fe3+ in BSO:Fe3+ under laser illumination. Forming a grid on the face of the crystal increases the light-induced charge transfer Cr2+/Cr4+ is equivalent to Cr3+. The use of laser illumination helped to shed more understanding on the assignment of the EPR signals as well as the dynamic behavior of the charge transfer processes.

Paper Details

Date Published: 25 October 1996
PDF: 12 pages
Proc. SPIE 2849, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications II, (25 October 1996); doi: 10.1117/12.255488
Show Author Affiliations
Abdalla M. Darwish, Alabama A&M Univ. (United States)
R. Sliz, Alabama A&M Univ. (United States)
Robert R. Copeland, Alabama A&M Univ. (United States)
Putcha Venkateswarlu, Alabama A&M Univ. (United States)
Jaeho Choi, Alabama A&M Univ. (United States)
Robert Metzl, Alabama A&M Univ. (United States)
Wen Shan Wang, Alabama A&M Univ. (United States)
Mohan D. Aggarwal, Alabama A&M Univ. (United States)
Alton Williams, Alabama A&M Univ. (United States)

Published in SPIE Proceedings Vol. 2849:
Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications II
Francis T. S. Yu; Shizhuo Yin, Editor(s)

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