Kilowatt-class diode laser system

A multi-wavelength laser system comprising:

• a wavelength beam combining resonator comprising:
• a first and second stack of laser emitters,
• a spatial interleaver configured to interleave the emitted beams from the first and second stack of laser emitters,
• a cylindrical transform optic positioned to receive the beams and overlap the beams along one dimension onto a dispersive element,
• a waveplate positioned between the transform optic and dispersive element,
• a second optical system positioned between the dispersive element and a partially-reflective output coupler, wherein feedback from the output coupler forms a resonator with the back facets of each of the emitters, and wherein the output coupler transmits a multi-wavelength beam;
• and
• a post resonator including:
• a polarization multiplexer,
• optical reconfiguration element,
• anamorphic element, and
• fiber-optic module.