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Opt Express. 2018 Sep 17;26(19):24723-24733. doi: 10.1364/OE.26.024723.

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


A dense spectral multiplexing structure based on the reflective volume Bragg gratings is introduced to realize the diode laser multiplexing with an ultra-narrow channel spacing of 1.5 nm. With the combination of polarization multiplexing and coarse spectral multiplexing, a diode laser source producing 2045 W power from an output fiber with a core diameter of 105 ┬Ám 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 multiplexing based on VBG to realize high output power and brightness.


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