Patent ID: 7663735
Filing Date: 2010-02-16
Classification: G03F

Abstract:
1. A microlithographic projection exposure apparatus, comprising: a) an illumination system for generating projection light; b) a projection lens for imaging a reticle arranged in an object plane of the projection lens onto a photosensitive layer, which is arranged in an image plane of the projection lens and is applied to a carrier, said projection lens comprising a last optical element on the image side; c) an immersion arrangement for introducing an immersion liquid into an immersion interspace formed between the last optical element and the photosensitive layer; and d) a transmission filter which is designed and arranged in the projection lens in such a way that all rays, which leave the last optical element and enter the immersion interspace at an angle of incidence α, are attenuated more strongly the smaller the angle of incidence α is.