a package for the components of a laser device that includes an elongated laser medium , a pump source adjacent to one side of the laser medium and laser mirrors positioned in alignment with the optical axis of the laser medium , the package including a planar heat conducting structure including a base member with a cavity formed on one side and a platform at an intermediate location for supporting the laser elements , and a closure member for closing the cavity around the laser elements , and a multi - conductor connection cable mounted in the package having connections to the pump source and to a source of electrical energy .