Patent ID: 8710471

Claim:
An installation having an object field and an image field, the installation comprising: a light source configured to generate EUV light with a pulse frequency; illumination optics configured to illuminate the object field with the EUV light, the illumination optics comprising a field facet mirror comprising a plurality of field facets including a first field facet and a second field facet; projection optics configured to map the object field into the image field; and a scanning device configured to deflect the EUV light onto the field facet mirror so that, during use of the installation: a first pulse of EUV light illuminates the first field facet without illuminating the second field facet; and a second pulse of EUV light illuminates the second field facet without illuminating the first facet, wherein: the installation is an EUV microlithography projection illumination installation; the scanning device has a first axis and a second axis perpendicular to the first axis; and during use of the illumination optics: light deflected by the scanning device impinges the field facet mirror; rotation of the scanning device about its first axis advances EUV light deflected by the scanning device along the field facet mirror in a first direction; and rotation of the scanning device about its second axis advances the EUV light deflected by the scanning device along the field facet mirror in a second direction which is different from the first direction.