Illumination system particularly for microlithography
    18.
    发明授权
    Illumination system particularly for microlithography 有权
    照明系统特别适用于微光刻

    公开(公告)号:US06438199B1

    公开(公告)日:2002-08-20

    申请号:US09679718

    申请日:2000-09-29

    IPC分类号: G21K504

    摘要: The invention concerns an illumination system, particularly for microlithography with wavelengths ≦193 nm, comprising a light source, a first optical component, a second optical component, an image plane and an exit pupil. The first optical component transforms the light source into a plurality of secondary light sources being imaged by the second optical component in said exit pupil. The first optical component comprises a first optical element having a plurality of first raster elements, which are imaged into said image plane producing a plurality of images being superimposed at least partially on a field in said image plane. The first raster elements deflect incoming ray bundles with first deflection angles, wherein at least two of the first deflection angles are different. The first raster elements are preferably rectangular, wherein the field is a segment of an annulus. To transform the rectangular images of the first raster elements into the segment of the annulus, the second optical component comprises a first field mirror for shaping the field to the segment of the annulus.

    摘要翻译: 本发明涉及一种照明系统,特别是对于具有波长<= 193nm的微光刻,其包括光源,第一光学部件,第二光学部件,图像平面和出射光瞳。 第一光学部件将光源变换成由所述出射光瞳中的第二光学部件成像的多个次级光源。 第一光学部件包括具有多个第一光栅元件的第一光学元件,其被成像到所述图像平面中,产生至少部分地叠加在所述图像平面中的场上的多个图像。 第一光栅元件以第一偏转角偏转入射光束,其中第一偏转角中的至少两个是不同的。 第一光栅元件优选地是矩形的,其中该场是环的一段。 为了将第一光栅元件的矩形图像变换成环形的区段,第二光学部件包括用于将场成形为环形部分的第一场镜。