1.8 μm emission of highly thulium doped fluorophosphate glasses

A new type of fluorophosphate glasses with high thulium doping concentration (up to 10 mol % Tm3+) is investigated. The intensive 1.8 mu m fluorescence is demonstrated with lower concentration quenching. On the basis of the measured Raman spectroscopy, it is revealed that the glass structure will be changed when adding Tm3+ ions into fluorophosphate glasses. Besides, the Judd-Ofelt parameters and radiative properties are calculated and discussed based on Judd-Ofelt theory. And the absorption and emission cross-sections of F-3(4)-> H-3(6) transition are also calculated by using McCumber and Beer-Lambert theories. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3499283]