MIDINFRARED LIGHT-EMISSION CHARACTERISTICS OF HO3+-DOPED CHALCOGENIDE AND HEAVY-METAL OXIDE GLASSES

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 mum (5/6 --> 5/8) and 2.0 mum (5/7 --> 5/8), another mid-infrared emission was observed at 2.9 mum 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 mum fluorescence was directly related to the low vibrational phonon energy of the host glasses.