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A 1.6-μm pumped 1.9-μm thulium-doped fluoride fiber laser and amplifier of very high efficiency

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6 Author(s)

Results are presented for color center, and semiconductor, laser pumping of the 1.82 μm transition in a thulium-doped fluoride fiber. As an amplifier small signal gain efficiencies of 8.1 dB/mN were attained with a maximum gain of 36.5 dB being achieved for around 17-18 mW of launched pump power. As a laser a maximum slope efficiency of 84% and a minimum threshold for oscillation of 330 μW was also demonstrated for this system. Furthermore by suppressing all reflections down to <36 dB superfluorescent or ASE output was observed. In achieving efficient operation with a diode laser pump source this system shows strong commercial potential

Published in:

IEEE Journal of Quantum Electronics  (Volume:31 ,  Issue: 3 )