Systems and methods for alignment of wavelength beam combining resonators

An alignment system for use with a laser resonator that spatially overlaps multiple input beams along a wavelength-beam-combining (WBC) dimension and outputs a resulting output beam from a beam output, the alignment system comprising:

• a dispersive element configured to disperse beams in the WBC dimension;
• a beam profiler for receiving beams and generating images of relative positions thereof;
• disposed optically downstream of the beam output and optically upstream of the beam profiler, a first lens having optical power in a non-WBC dimension perpendicular to the WBC dimension;
• disposed optically downstream of the dispersive element and optically upstream of the beam profiler, a second lens, having optical power in the WBC dimension, for focusing dispersed beams on the beam profiler;
• disposed optically downstream of the beam output and optically upstream of the beam profiler, a third lens having optical power in the non-WBC dimension;
• and
• a plurality of optical elements configured to (i) receive the output beam, (ii) direct a first portion of the output beam to the third lens, and (iii) direct a second portion of the output beam to the first lens.