Abstract
Emission characteristics of Ho3+-doped heavy-metal oxide and chalcogenide glasses were investigated and compared with those of conventional oxide glasses. In addition to the fluorescence at approximately 1.2 μm (5/6 → 5/8) and 2.0 μm (5/7 → 5/8), another mid-infrared emission was observed at 2.9 μm from the transition 5/6 → 5/7. The calculated radiative transition probability and multiphonon decay rate of the latter transition using Judd-Ofelt analysis indicated that the occurrence of the 2.9 μm fluorescence was directly related to the low vibrational phonon energy of the host glasses.
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