A modified hollow‐bore ridge waveguide, utilizing a staggered ridge geometry, has been used successfully to obtain single‐frequency operation from an array of CO2waveguide lasers. The gain volume of the array is equivalent to six waveguide lasers of 37 cm length and 2.25×2.25 mm2cross section. The output power from the sealed‐off device reached 68 W cw. Stable single‐frequency operation in the antisymmetric supermode was observed.