Rare-earth-doped fluoride glasses for active optical fiber applications

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Abstract
The thermal and optical properties of a new series of fluoride glasses suitable for active fiber applications are presented. The glasses are based on barium, indium, gallium and zinc fluorides, and in the presence of LuF3 and PbF2 they exhibit a critical cooling rate of 16 degree(s)C min-1. The lowest fiber attenuation is found to be 0.5 dB m-1 at 2.7 micrometers . Compared to fluorozirconate glasses, their infrared transparency is shifted nearly 1 micrometers toward longer wavelengths. By means of Judd-Ofelt calculations and lifetime measurements on Er3+ doped samples, the multiphonon emission rate for this hose is investigated and compared to fluorozirconates.

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