Journal
OPTICS EXPRESS
Volume 13, Issue 12, Pages 4731-4736Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPEX.13.004731
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A 3(rd)-order cascaded Raman fiber laser has been demonstrated without using fiber Bragg gratings at all in the entire laser system. More than 2 W output power at the 3(rd) Stokes emission wavelength of 1307 nm, a bandwidth of 4.2 nm and a slope efficiency of similar to 46% was measured when a 500 m long moderately Ge-doped silica fiber was pumped by a free running broadband Yb3+-doped fiber laser. This method is simple, versatile and cheap when compared with conventional methods employing narrow band pumping and fiber Bragg gratings to resonate the Stokes wavelengths. A slope efficiency of similar to 72% and an output power of over 4 W was also achieved at the 1(st) order Stokes wavelength of 1168 nm when a 130 m long Ge-doped silica fiber was used. (C) 2005 Optical Society of America.
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