Patent ID: 8760744

Claim:
A device, comprising: a correction light source; and a mirror arrangement multi-mirror array comprising a plurality of mirror elements arranged side by side in rows and columns in a plane, the mirror elements being configured to be swivelled separately from each other, wherein: the plurality of mirror elements are configured to deflect correction light from the correction light source to an optical element of an optical arrangement such that a first part of a surface of the optical element of the optical arrangement is irradiated in a locally variable fashion and/or a temporally variable fashion; the correction light beam is configured to heat the optical element for a period of time in which the optical element is unevenly heated by an imaging light beam; a second part of the surface of the optical element is irradiated by the imaging light beam; and the first part of the surface of the optical element is different from the second part of the surface of the optical element.