FLUORESCENCE AND ATTENUATION PROPERTIES OF ER3-DOPED PHOSPHATE-GLASS FIBERS AND EFFICIENT INFRARED-TO-VISIBLE UP-CONVERSION()

Fluorescence spectra of phosphate glasses with different erbium doping have been measured. The flourescence intensity reaches its maximum at an Er3+-doping concentration of 0.75 mol%. When the Er3+ doping excee ds 0.75 mol%,the fluorescence intensity decreases due to concentration quenching. The attenuation at 1.53 mu m of the fiber is 12.8 db/m. Th e fluorescence up-conversion of 1.064 mu m Nd:YAG laser pulses into in tense green 547 and 667 nm light in the fiber has been measured. The f luorescence output power of green (547 nm) and red (667 nm) light is 1 78 and 42 mu W, respectively with an excitation power of 1 W. The two signals are referred to as S-4(3/2) --> I-4(15/2) and F-4(9/2) --> I-4 (15/2) transitions through two-photon absorption fluorescence.