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An efficient 1.46 μm thulium fiber laser via a cascade process

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3 Author(s)
Allen, R. ; US Naval Res. Lab., Washington, DC, USA ; Esterowitz, L. ; Aggarwal, I.

Continuous wave (CW) lasing in a thulium-doped fluorozirconate fiber at 1.46 μm with a 20% slope efficiency was observed. Simultaneous lasing at 1.86 μm with 29% slope efficiency depopulates the normally long lived 1.46-μm terminal level. It is shown that the cascade process can increase the slope efficiency ηs, of the 1.45-μm transition by a factor of ten and the 1.86-μm transition by a factor of eight. Calculations indicate that the CW laser thresholds decrease significantly

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Quantum Electronics, IEEE Journal of  (Volume:29 ,  Issue: 2 )