Abstract

Dysprosium-doped borate glasses were prepared and their physical properties, optical absorption and fluorescence characteristics were investigated. Among three Judd-Ofelt parameters, the O₂ increased and the O₆ decreased with an increasing Na₂O content. The Branching ratio of blue/yellow emission from the ⁴F_9/2 level increased and its lifetime decreased with Na₂O content. The lifetime of the ⁴F_9/2 level increased with increasing temperature, which is unusual for most rare earth levels. Moreover, the branching ratio of blue/yellow emissions also changed with temperature. These behaviors could be explained by considering the temperature change of local structure and radiative transition probability of Dy³⁺ ions in the borate glasses.

© 1997 Optical Society of America