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Wide wavelength tuning by a variable reflective output coupler is demonstrated in high-power double-clad Tm3+-doped silica fiber lasers diode-pumped at ∼790  nm. Varying the output coupling from 96% to 5%, the laser wavelength is tuned over a range of 106  nm from 1949 to 2055  nm. The output power exceeds 20  W over 90-nm range and the maximum output power is 32  W at 1949  nm for 51-W launched pump power, corresponding to a slope efficiency of ∼70%. Assisted with different fiber lengths, the tuning range is expanded to 240  nm from 1866 to 2107  nm with the output power larger than 10  W

research letters in optics

High Power<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mtext>Tm</mml:mtext><mml:mrow><mml:mn mathvariant="bold">3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math>-Doped Fiber Lasers Tuned by a Variable Reflective Output Coupler

High PowerTm3+-Doped Fiber Lasers Tuned by a Variable Reflective Output Coupler