Shen, D.Y., Sahu, Jayanta and Clarkson, W.A.
High-power widely tunable Tm:fibre lasers pumped by an Er, Yb co-doped fibre laser at 1.6 microns
Optics Express, 14, (13), . (doi:10.1364/OE.14.006084).
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High-power and widely tunable Tm-doped silica fibre lasers cladding-pumped and core-pumped by a 1565nm Er,Yb fibre laser are reported. Output power up to 19.2W was generated from the cladding pumped cavity configuration for ~38.2W of launched pump power and with slope efficiency up to ~72% with respect to absorbed pump power. Wavelength tuning was realized by use of an external cavity containing a diffraction grating. A maximum output power of 17.4W at 1941nm was generated for 38.2W of launched pump power and the operating wavelength could be tuned over 202nm from 1859 to 2061nm. In the core-pumped configuration, a maximum output power of 12.1W was generated at 1851nm for 23.1W absorbed pump power using a simple free-running cavity configuration with only ~24cm of Tm-doped fibre. By employing a tunable cavity configuration, the operating wavelength of the core-pumped Tm:fibre laser could be tuned over 250nm from 1723-1973nm at multiwatt power levels.
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