Patent ID: 8509281

Claim:
A laser apparatus comprising: a substrate configured to increase an intensity of light at a desired wavelength, the substrate comprising: a plurality of sections first suppression material at a number of locations within each section of the plurality of sections, the first suppression material comprises different sizes and shapes at each location of the number of locations; an outer edge outside of which is second suppression material; the second suppression material also located between each section of the plurality of sections; each section of the plurality of sections doped with a first dopant to amplify light at the desired wavelength; the first suppression material and the second suppression material are doped with a second dopant to attenuate transmission of light; and a cooling system for the substrate configured to allow gas to be transmitted through the cooling system and receive heat generated in the substrate from a back side of the substrate, wherein the gas is liquefied gas; wherein a concentration of the first dopant changes over a distance so that the concentration is less at the edge of each section of the plurality of sections than in a middle portion of each section of the plurality of sections.