The invention relates to quantum electronics. The laser contains an active element (3) which is located between two resonator mirrors (1 and 2). Located between the resonator mirror (1) having a radius of curvature (R) and the active element (3) is an optical system (4) in which the position of the optical main plane and the main focal length satisfy the relationship: <IMAGE> where h1 is the distance between the first main plane of the optical system from the mirror having a radius of curvature (R); h2 is the distance of the second main plane of the optical system from the closest end surface of the active element, and h is the distance between the optical main plane of the active element and its end surface. The laser is primarily intended for precision-laser technology, for example for matching micro-resistors. <IMAGE>
