The present invention pertains to a composite slab laser gain medium with an undoped core and at least one doped gain medium section disposed on at least one side of that core. The gain medium is constructed so as to mitigate the effects of thermal and mechanical stresses within it and also allow for...http://www.google.se/patents/US7822091?utm_source=gb-gplus-sharePatent US7822091 - Inverted composite slab sandwich laser gain medium
