UV laser induced transmission change of pure and doped silica glass

Abstract

Pure and F, GeO₂-doped silica glass cut from fiber preforms prepared by plasma assisted chemical vapor deposition(PCVD) were investigated by ultraviolet absorption spectroscopy. The ultraviolet absorption characteristics of these glasses were also studied after UV laser irradiation and heating treatment. It was found that absorption band near 240 nm assigned to GODC was found both in GeO₂-doped and F-GeO₂ co-doped silica glass, but absorption intensity of the latter was lower than that of the former. It’s because F can react with GODC and GeE’ simultaneously and reduce their concentration. After irradiation, UV absorption change of F-GeO₂ co-doped silica glass was weaker than that of GeO₂-doped silica glass,it thus can be concluded that introduction of F could depress the UV absorption of GeO₂-doped silica core effectively.

Keywords

irradiation / color center / absorption spectrum

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