High brightness pumps for fiber lasers based on monolithically grating stabilized diode lasers

Abstract

Innovation in diode laser design and technology, assembly techniques and optical design are used to realize highbrightness pump modules for application in pumping of fiber lasers. In a first demonstration, monolithically gratingstabilized diode lasers with wavelength around 970 nm are integrated into prototype modules that deliver 500 W of continuous wave TE-polarized optical power at a conversion efficiency > 55% within a spectral width of 1.2 nm (95% power) in a narrow beam, suitable for low-loss coupling into a 200-µm core fiber. An especially simple opto-mechanical configuration is developed, without need for external volume Bragg gratings.