Techniques for fabrication of multilayer dielectric mirrors with the reflectivity varying over their surfaces are described. They were used at the output of the cavity of a high-power industrial Nd 3+ : YAG laser to form a beam with a Gaussian or super-Gaussian intensity distribution. The permissible range of variation of the mirror reflectivity was 40%-90% and it was reproducible from sample to sample to within 5%. A mirror with the reflectivity of 84% was used at the output of a plane-plane cavity of a cw Nd 3+ : YAG laser (output power 12 W) to increase the axial brightness by a factor of 17.
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