title: Multiwatts narrow linewidth fiber Raman amplifiers.
abstract: 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.
authors.affiliation: European Southern Observatory, Garching, Germany. yfeng@eso.org
authors.forename: Yan
authors.initials: Y
authors.lastname: Feng
authors.forename: Luke
authors.initials: L
authors.lastname: Taylor
authors.forename: Domenico
authors.initials: D
authors.lastname: Bonaccini Calia
mesh_terms: 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*