Abstract
In 70B2O3–30CaO–xTb2O3 glasses (x=0.10–20.0 (mole fraction)) prepared by the melt-quenching method, the decay behavior of the green fluorescence due to the 5D4→7F5 transition of Tb3+ ions was investigated by measuring the fluorescence spectra and time-resolved fluorescence spectra and then by analysis using the integrated intensity ratio of fluorescence bands due to the 5D3→7FJ (J=5, 4, and 3) and 5D4→7FJ (J=6, 5, 4, 3, 2, 1, and 0) transitions of Tb3+ ions, and the rate equations. In a 70B2O3–30CaO glass with high phonon energy, it was found that the 98.5% of all the excited electrons of Tb3+ ions were relaxed from the 5D3 to 5D4 level due to the multiphonon relaxation (MR) process. In addition, for x>6.0, the green fluorescence rapidly decayed with increasing x, because the cross-relaxation process, (5D4→7F0)→3(7F0←7F6) among the excited Tb3+ ion at 5D4 and its three neighboring Tb3+ ions at 7F6 easily occurred. For x=6, the cross-relaxation process, (5D3→5D4)→(7F0←7F6) between Tb3+ ions was fully promoted and the cross-relaxation process, (5D4→7F0)→3(7F0←7F6) was repressed, and almost 100% of excited electrons in Tb3+ ions were available for the fluorescence due to the 5D4→7FJ transitions. As a result, it was found that the 70B2O3–30CaO–6Tb2O3 glass had a potential of the green fiber laser.
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