Photoinduced charge transfer in BSO:Cr3+ homegrown single crystal at room temperature during grating formation under Ar+ laser illumination in EPR experiment

Abdalla M. Darwish; R. Sliz; Robert R. Copeland; Putcha Venkateswarlu; Jaeho Choi; Robert Metzl; Wen Shan Wang; Mohan D. Aggarwal; Alton Williams

doi:10.1117/12.255488

25 October 1996 Photoinduced charge transfer in BSO:Cr3+ homegrown single crystal at room temperature during grating formation under Ar+ laser illumination in EPR experiment

Abdalla M. Darwish, R. Sliz, Robert R. Copeland, Putcha Venkateswarlu, Jaeho Choi, Robert Metzl, Wen Shan Wang, Mohan D. Aggarwal, Alton Williams

Author Affiliations +

Proceedings Volume 2849, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications II; (1996) https://doi.org/10.1117/12.255488
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

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.

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Abdalla M. Darwish, R. Sliz, Robert R. Copeland, Putcha Venkateswarlu, Jaeho Choi, Robert Metzl, Wen Shan Wang, Mohan D. Aggarwal, and Alton Williams "Photoinduced charge transfer in BSO:Cr3+ homegrown single crystal at room temperature during grating formation under Ar+ laser illumination in EPR experiment", Proc. SPIE 2849, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications II, (25 October 1996); https://doi.org/10.1117/12.255488

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