Abstract
The optical properties of transparent chromium-doped glass-ceramics with the chemical composition similar to that of cunyite (Cr 4+:Ca 2GeO 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 2GeO 4. By comparison of Ca 2GeO 4 – like glass-ceramics with the Ca 2GeO 4 bulk single crystals and Mg 2SiO 4 – glass-ceramics we concluded that the nanocrystal phase is a modified Ca 2GeO 4 structure. Broadband fluorescence and a high quantum efficiency of new glass-ceramics make the new Cr-doped glass-ceramics promising medium for fiber lasers and amplifiers.
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