A series of graded-reflectivity mirrors from Research Electro-Optics Inc. enables precise spatial shaping of the intensity and phase characteristics of laser beams. In the mirrors, the reflectivity and/or phase effects of the coating vary radially across the surface of the optic. The company can produce the devices with virtually any arbitrary variation, including nonrotationally symmetric patterns, as well as with complex designs in which the reflectivity increases and decreases repeatedly across the component. They often are used as cavity optics in unstable resonator lasers. The mirrors are available with diameters from 6 to 127 mm and are offered on a wide range of substrate materials, including fused silica, various optical glasses, ZnSe, ZnS and Si, for operation over the 266-nm to 5-μm spectral range.