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We devise a laser-controlled adaptive optical element which operatesintracavity under high intensity radiation. This element substitutes aconventional mechanically deformable mirror and is free of criticalheat-sensitive components and electronics. The deformation mechanism is basedon the projection of a CW control laser onto a specially designed mirror.Mounted to a water-cooled heat sink, the mirror can handle laser radiationbeyond 3 MW/cm^2. The properties of the adaptive optical element including themaximum correctable wavefront pitch of 800 nm are discussed. The successfulimplementation in a multipass thin disk amplifier is presented. An improvementof the beam quality by a factor of three is achieved. We identify measures toenhance the performance of the adaptive optic towards efficient operation in ahigh-power laser system.

Laser-controlled adaptive optic for beam quality enhancement in a multipass thin disk amplifier