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Spectroscopic study of chromium-doped transparent calcium germanate glass-ceramics

✍ Scribed by M.Yu. Sharonov; A.B. Bykov; T. Myint; V. Petricevic; R.R. Alfano

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
248 KB
Volume
275
Category
Article
ISSN
0030-4018

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✦ Synopsis

The optical properties of transparent chromium-doped glass-ceramics with the chemical composition similar to that of cunyite (Cr 4+ :Ca 2 GeO 4 ) laser crystal were investigated. Room and low temperature absorption, excitation, fluorescence and Raman spectroscopy, as well as lifetime measurements were used to develop a model for the optical centers in the glass and nanocrystals. Parent (as quenched) glass does not exhibit any fluorescence; after the heat treatment Cr 4+ fluorescence band appears at $1280 nm. Optical properties of nanocrystals formed in the glass-ceramics differ from those in the bulk single crystal Ca 2 GeO 4 . By comparison of Ca 2 GeO 4 -like glass-ceramics with the Ca 2 GeO 4 bulk single crystals and Mg 2 SiO 4 -glass-ceramics we concluded that the nanocrystal phase is a modified Ca 2 GeO 4 structure. Broadband fluorescence and a high quantum efficiency of new glass-ceramics make the new Cr-doped glassceramics promising medium for fiber lasers and amplifiers.

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