Journal
OPTICS COMMUNICATIONS
Volume 275, Issue 1, Pages 123-128Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2007.02.058
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The optical properties of transparent chromium-doped glass-ceramics with the chemical composition similar to that of cunyite (Cr4+:Ca2GeO4) 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 Cr4+ fluorescence band appears at 1280 rim. Optical properties of nanocrystals formed in the glass-ceramics differ from those in the bulk single crystal Ca2GeO4. By comparison of Ca2GeO4 - like glass-ceramics with the Ca2GeO4 bulk single crystals and Mg2SiO4 - glass-ceramics we concluded that the nanocrystal phase is a modified Ca2GeO4 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. Published by Elsevier B.V.
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