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10 December 1999 Heavy-metal oxide glasses as potential materials for VIS fiber laser
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Variations of the lead germanate glasses composition were made and the effects in glass transition temperature, crystallization behavior and UV-VIS-IR transmission were studied. Reducing the lead content and partial substitution of oxides by fluorides causes a blue shift of the optical bandgap of bulk material of about 15 nm. However, the fluoride incorporation into the lead germanate glasses leads to a variation of sample composition by the evaporation of fluorides at temperatures around 1200 degrees Celsius. Spectral and time resolved fluorescence investigations on Tm3+ and Yb3+ doped lead germanate glasses were carried out. The samples show a weak red (650 nm), intensive blue (480 nm) and near-infrared (800 nm) emission under 976 nm excitation. A comparison of thulium fluorescence lifetimes in different glass hosts is given. The fiber drawing procedures of unstructured and multimode fibers and the loss behavior of the core and cladding glasses are described. Unstructured fibers show a minimum loss of about 0.3 dB(DOT)m-1 at 580 nm.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kay Schuster, Johannes Kirchhof, Jens Kobelke, Anka Schwuchow, and Michael Scheffler "Heavy-metal oxide glasses as potential materials for VIS fiber laser", Proc. SPIE 3849, Infrared Optical Fibers and Their Applications, (10 December 1999); doi: 10.1117/12.372793;


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