Fundamental mode lasers at high power are desirable to accommodate many industrial and scientific applications especially in pulsed mode of operation. Due to its unique properties the thin disk laser (TDL) concept is an ideal platform for the generation of high optical power with excellent beam quality. Reliability, low brightness constraints for the pump source, insensitivity to back reflections, negligible nonlinearities, high scalability are a few inherent properties, and thus TDLs have been widely used in industrial applications. In the past there have been many efforts to reach the maximum output power keeping the beam quality close to the diffraction limit. Piehler et al.  recently demonstrated 1.1 kW with M2<1.3 using adaptive optics inside the resonator whereas Peng et al.  achieved 1.1 kW with M2<1.4 by evacuating the laser resonator. 4 kW with M2<1.4 have been shown in  by optimizing the resonator design for a specific operation point in the stability zone.
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