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Effect of doping on the UV optical absorption in silica sol gel glasses is studied through investigating the variation of structure and photochemical transformation of oxygen deficient centers. Optical absorption spectra of silica and lithium, aluminum germano-silica sol gel glasses reveal a change in the structure with changing the concentration of complements, specifically transformation of oxygen deficient centers and formation of new centers. Photosensitive response in germano-silicate glasses is enhanced by lithium ions, which act efficiently as charge compensators. Improvement on the change of refractive index is shown in samples containing lithium.
Alexander Leyderman,Daniel Arcos, andCharles Y. C. Lee
"Effect of doping on photosensitivity of sol-gel derived silica glasses", Proc. SPIE 4459, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VII, and Optical Data Storage, (23 January 2002); https://doi.org/10.1117/12.454040
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Alexander Leyderman, Daniel Arcos, Charles Y. C. Lee, "Effect of doping on photosensitivity of sol-gel derived silica glasses," Proc. SPIE 4459, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VII, and Optical Data Storage, (23 January 2002); https://doi.org/10.1117/12.454040