2 μm emission properties in Tm3+/Ho3+ codoped fluorophosphate glasses

New type of fluorophosphate glasses with different Tm3+/Ho3+ doping concentrations have been prepared. From the measured fluorescence spectra, strong emission near 2 mu m is demonstrated in the samples. Based on the absorption spectra, the Judd-Ofelt parameters and radiative properties were calculated and compared with those of other glass hosts. Then for our prepared Tm3+/Ho3+ codoped fluorophosphate glass, the higher predicted spontaneous transition probability (76.54 s(-1)) along with the larger calculated emission cross-section (6.15x10(-21) cm(2)) gives evidence of intense 2 mu m fluorescence. Besides, it is found that the optimum doping concentration is 4 mol% Tm3+/1 mol% Ho3+ for the strongest 2 mu m emission in our prepared samples.