Patent ID: 6888872

Claim:
A laser oscillator comprising: a linear unstable optical resonator formed by at least one at least partially reflecting element, said linear unstable optical resonator operable for recirculating laser radiation at a cavity wavelength to establish a cavity mode of operation; an active mirror amplifier in communication with said linear unstable optical resonator, said active mirror amplifier including; a substrate; a laser gain medium supported by said substrate; a flowing coolant for cooling said laser gain medium; said coolant being provided to and from said substrate by a plurality of coolant transfer tubes; said tubes protecting said substrate from hydrostatic pressure loads resulting from the coolant flowing through said substrate; a positioning mount in communication with said substrate for adjusting a position of said laser gain medium; and wherein said adjustments can be effected without affecting the operation of said coolant transfer tubes and without exerting significant forces onto the substrate from said coolant transfer tubes.