UP-CONVERSION OF 1.064 MU-M ND-YAC LASER-PULSES INTO INTENSE VISIBLE-LIGHT IN ERBIUM-DOPED PHOSPHATE FIBERS

Absorption spectra and fluorescence spectra in Er3+-doped phosphate glasses have been measured. Some emission parameters, such as emission cross section, spontaneous emission probability, and fluorescence linewidth of the Er3+-doped phosphate glass, have been calculated. Upconversion of 1.064 mu m Nd:YAG laser pulses into intense green 547 nm and red 667 nm light in a Er3+-doped phosphate glass fiber has been achieved. Fluorescence efficiencies of the two signals, green 547 nm and red 667 nm fluorescences, are 1.78X10(-2)% and 4.2X10(-3)%, respectively. The two signals are refered to S-4(3/2)-->I-4(15/2) and F-4(9/2)-->I-4(15/2) radiative transitions by two-photon absorption fluorescence.