Patent ID: 8259763
Filing Date: 2012-09-04
Classification: H01S

Abstract:
1. A laser oscillator comprising: an optical resonator having an input side reflection mirror and an output side reflection mirror; a laser gain medium arranged between said input side reflection mirror and said output side reflection mirror; and a pumping light source configured to supply a pumping light beam to said laser gain medium, wherein said laser gain medium comprises: an optical medium configured to transmit a laser beam and the pumping light 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 said pumping light source 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 pumping light beam is incident from said pumping light source into said optical medium through said incident face, and pumps up said first and second face gain media through an optical path while being alternately reflected by said first face gain media and said second face gain media, wherein the laser beam is generated in said optical resonator, is propagated on the optical path and is amplified in said optical resonator 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.