Spectral beam combiner with independent wavelength stabilization

A spectral beam combiner comprising:

• a plurality of individual laser beam sources, each emitting a beam at a different wavelength to create a plurality of laser beams;
• a diffraction grating disposed to intercept the plurality of laser beams, the diffraction grating configured to direct a majority of the optical power of each beam into a defined first diffraction order to form a spectrally-combined, high-power optical output and direct a residual optical power of each beam into a defined second diffraction order to form a spectrally-combined, low-power beam;
• and
• wavelength stabilization optics disposed to intercept the spectrally-combined, low-power beam, the wavelength stabilization optics including
• a turning mirror positioned to intercept spectrally-combined, low-power beam and re-direct the low-power beam along a stabilization path;
• and
• a high-reflectivity (HR) mirror disposed along the stabilization path at a spaced-apart distance L from the turning mirror, the spaced-apart distance L selected to form a resonant cavity with the plurality of individual laser beam sources and provide wavelength stability for the plurality of laser beams.