Abstract

Intense mid-infrared emission at 3.9 µm in ${{\rm Ho}^{3 +}}$-doped ZBYA glasses with direct upper laser level (${{\rm Ho}^{3 +}}:{^5}{\rm I}_5$) pumping at a wavelength of 888 nm is reported for the first time, to the best of our knowledge. Spectroscopic parameters were determined using the Judd–Ofelt theory and the measured absorption spectrum. The maximum emission cross section of the ${{\rm Ho}^{3 +}}$-doped ZBYA glass is estimated to be $2.7 \times {10^{- 21}}\;{{\rm cm}^2}$ at 3906 nm. Additionally, fluorescence spectra and lifetimes of ZBYA glasses with different ${{\rm Ho}^{3 +}}$ ion doping concentrations were measured. The results provide theoretical and experimental basis for better selection of rare-earth-doped matrix glasses to achieve a fluorescence output centered on a wavelength of 3.9 µm.

© 2020 Optical Society of America

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