Abstract
The near-infrared luminescence of Bi-doped aluminosilicate fiber within pump wavelengths between 710 and 990nm and under varying pump powers and operation temperatures has been investigated systematically. It is revealed that there exist two emission bands peaking around 1120 and at 1300nm, which are believed to be associated with two different aluminum-related bismuth active centers (BAC-Al1 and BAC-Al2); the BAC-Al2 is found to be more efficiently excited at a lower temperature within the spectral range of 790-850nm. This is the first time, to the best of our knowledge, that two sub-bands of BAC-Al are identified. The thermal annealing effect on the luminescence of BACs is also studied under 830nm pumping. In contrast to the quenching of BAC-Si, the luminescence intensity of BAC-Al1 is enhanced by 1.5 times after 500°C heating and subsequent cooling. The results demonstrate an effective strategy for tuning the emission scheme in the range of 1100-1400nm by adjusting the excitation wavelength and operation temperature.
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