kW-class fiber-coupled diode laser source based on dense spectral multiplexing of an ultra-narrow channel spacing

A dense spectral multiplexingstructure based on the reflective volume Bragg gratings is introduced to realize the diode laser multiplexingwith an ultra-narrow channel spacingof 1.5 nm. With the combination of polarization multiplexingand coarse spectral multiplexing, a diode laser source producing 2045 W power from an output fiber with a core diameter of 105 µm and NA of 0.2 is achieved at an injection current of 10 A. The electro-optical and optical-optical efficiency of the laser source is 42% and 76%, respectively. Experimental results demonstrate the ability of dense spectral multiplexingbased on VBG to realize high output power and brightness.