Patent ID: 8068523

Claim:
A laser gain medium comprising: an optical medium configured to transmit a laser beam and having an incident face, a first face, a second face opposing to said first face; and a plurality of gain media pumped by a pumping light beam and configured to amplify the laser beam while reflecting the laser beam, wherein said plurality of gain media are formed of same optical material and doped with at least one active element, wherein ones of said plurality of gain media are joined on a first face of said optical medium as first face gain media, and the remaining gain media are joined on a second face of said optical medium as second face gain media, wherein the laser beam is amplified by said first face gain medium and said second face gain media while being alternately reflected by said first face gain media and said second face gain media, and wherein at least one of (i) dope quantities of the active element into said plurality of gain media and (ii) thicknesses of said plurality of gain media in a direction perpendicular to the first or second face is adjusted such that an amount of heat generated by absorbing the pumping light beam is uniform over said plurality of gain media.