EUV EXPOSURE APPARATUS

摘要

A projection lens of an EUV-lithographic projection exposure system, comprising a plurality of reflective optical elements, each comprising a body and a reflective surface for projecting an object field on a reticle onto an image field on a substrate if the projection lens is exposed with an exposure power of EUV light. The lens further comprises support means for passively or actively supporting at least one optical element which is controlled to a temperature by a first tempering means. The support means comprising a temperature sensitive element, wherein the temperature sensitive element is controlled to a constant or to a predefined temperature by a second tempering element which is arranged between the temperature sensitive element and the first tempering element.