IEEE Spectrum had their usual interesting in-depth look at this a few years ago, for military fiber lasers. https://spectrum.ieee.org/fiber-lasers-mean-ray-gun

IEEE Spectrum had their usual interesting in-depth look at this a few years ago, for military fiber lasers. https://spectrum.ieee.org/fiber-lasers-mean-ray-guns-are-coming https://spectrum.ieee.org/fiber-lasers-mean-ray-guns-are-com... The technique appears to involve multiple lasers of slightly different wavelength; this allows the beams to be combined and to not interfere with each other.