Multiwatts narrow linewidth fiber Raman amplifiers.
Up to 4.8 W, approximately 10 MHz, 1178 nm laser is obtained by Raman amplification of a distributed feedback diode laser in standard single mode fibers pumped by an 1120 nm Yb fiber laser. More than 10% efficiency and 27 dB amplification is achieved, limited by onset of stimulated Brillouin scattering. The ratio of Raman to Brillouin gain coefficient of a fiber is identified as a figure of merit for building a narrow linewidth fiber Raman amplifier.
Feng
Yan
Y
European Southern Observatory, Garching, Germany. yfeng@eso.org
Taylor
Luke
L
Bonaccini Calia
Domenico
D
D000669:Amplifiers, Electronic; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D054023:Lasers, Semiconductor; D013059:Spectrum Analysis, Raman / Q000295:instrumentation*