Intense mid-infrared emission at 3.9 µm in Ho3+-doped ZBYA glasses for potential use as a fiber laser

Intense mid-infrared emission at 3.9 µm in H o 3+ -doped ZBYA glasses with direct upper laser level ( H o 3+ : 5 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 H o 3+ -doped ZBYA glass is estimated to be 2.7×10 -21 c m 2 at 3906 nm. Additionally, fluorescence spectra and lifetimes of ZBYA glasses with differen H o 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.