optical maser(n = noun.artifact) laser - an acronym for light amplification by stimulated emission of radiation; an optical device that produces an intense monochromatic beam of coherent light;
is a kind of optical device
is a part of photocoagulator

gas maser, maser, optical, optical aberration, optical activity, optical bench, optical cable, optical condenser, optical crown, optical crown glass, optical device, optical disc, optical disk, optical fiber, optical fibre, optical flint, optical fusion, optical glass, optical illusion, optical instrument, optical lens, optical opacity, optical phenomenon, optical prism, optical pyrometer, optical telescope