A 2.3 W single transverse mode thulium-doped fluoride fiber laser based on fiber Bragg gratings is presented. The laser has a conversion efficiency of 65% to be compared to the quantum limit of 72%. The performances of the laser are compared for two pump wavelengths of 1040 and 1064 nm and are analyzed based on a rate equation analysis.
Centre d'optique photonique et laser, Pavillon d'optique photonique, 2375 rue de la Terrasse, Université Laval, Québec (QC), G1V 0A6, Canada. guillaume.androz.1@ulaval.ca