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The 1.475 mu m selfterminating transition in a thulium-doped fluorozirconate fibre has been operated CW with thresholds as low as 3.2 mW of launched pump power. Furthermore, by enforcing oscillation at 1.475 and 1.88 mu m simultaneously, output powers of approximately 130 and approximately 115 mW, respectively, have been observed for around 325 mW of launched pump power. These results correspond to...
Efficient amplification at around 0.8 mu m in a monomode Tm/sup 3+/-doped fluorozirconate fibre is reported. A gain of 23 dB at 805 nm was achieved for 50 mW of pump power at 780 nm. Low threshold (15 mW), high slope efficiency (>60%) laser oscillation in this wavelength region is also described.<<ETX>>
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