A high-power and widely tunable all-fiber Raman laser is demonstrated. The Raman fiber laser has been tuned over a range of 60 nm from 1075 to 1135 nm and delivers up to 5.0 W of Stokes output power for 6.5 W of launched pump power. Efficiencies ranging from 76.1 to 93.1% and laser thresholds from 0.78 to 2.59 W have been measured. The spectrum of the depolarized Raman gain coefficient of the germanosilicate fiber has also been inferred from our experimental measurements.
Erik Bélanger, Martin Bernier, Dominic Faucher, Daniel Côté, and Réal Vallée, "High-Power and Widely Tunable All-Fiber Raman Laser," J. Lightwave Technol. 26, 1696-1701 (2008)