Efficient 2.0 mu m emission in Er3+/Ho3+ co-doped barium gallo-germanate glasses under different excitations for mid-infrared laser

摘要

We report the visible up-conversion, near to middle infrared luminescence, and energy transfer mechanism of Er3+/Ho3+ co-doped barium gallo-germanate glasses under 980 and 1550 nm excitations, respectively. The 2.0 mu m emission lifetime of the present glass is as high as 5.67 ms with the corresponding energy transfer efficiency of 70.0% from Er3+:I-4(13/2) to Ho3+:I-5(7) when pumped by 980 nm laser diode. In addition, the enhanced 2.0 mu m emission is also obtained upon excitation of 1550 nm due to the efficient energy transfer from Er3+ to Ho3+. Meanwhile, the calculated maximum gain is 2.13 cm(-1) at 2024 nm. These results suggest that Er3+/Ho3+ co-doped barium gallo-germanate glasses is a potential material for 2.0 mu m fiber laser. (c) 2015 Elsevier B.V. All rights reserved.