frequency stabilization is disclosed for a laser device , wherein the laser tube is provided with end mirrors which are mounted in extensions at the respective ends of the laser tube . the laser tube extensions have reduced sections which are movable to allow adjustment of the end mirrors in the laser device . the reduced sections are preferably made of metallic material . the means to stabilize frequency provided is the application of heat or current or both to and around a reduced metallic section in the laser tube extension . this may be accomplished by the passing of current through a wire wrapped around the reduced metallic section . the passing of such current causes the reduced metallic section to contract and expand along an axis in line with the laser tube , and as well as a magnetic field is induced upon the gaseous medium within the laser tube . by such means controlled by suitable circuitry , laser frequency stabilization is accomplished . the means provided may be mounted on commercially available laser devices .