Abstract
Efficient, high-power, and widely tunable Tm-doped fiber lasers
cladding-pumped by diode lasers at 791 nm are demonstrated by use of an external
cavity containing a diffraction grating. A maximum output power of 62 W is obtained
at 2 004 nm for 140 W of launched pump power, corresponding to a slope efficiency of
48% with respect to launched pump power. The operating wavelength is tunable over
200 nm (1 895 to 2 109 nm), with >52 W of output power over a tuning range of 140
nm (1 926 to 2 070 nm). Prospects for further improvement in output power, lasing
efficiency, and tuning range are considered.
© 2012 Chinese Optics Letters
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