Device for the range-resolved determination of scattered light, operating method, illumination mask and image-field mask

An illumination mask ( 10 a) for a device for the range-resolved determination of scattered light, having one or more scattered-light measuring structures ( 11 a) which respectively include an inner dark-field zone which defines a minimum scattering range, to an associated image-field mask and a cor...

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Bibliographische Detailangaben
Hauptverfasser: GROMER OSWALD, MANGER MATTHIAS, ARNZ MICHAEL, STUEHLER JOACHIM, KLOSE GERD
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:An illumination mask ( 10 a) for a device for the range-resolved determination of scattered light, having one or more scattered-light measuring structures ( 11 a) which respectively include an inner dark-field zone which defines a minimum scattering range, to an associated image-field mask and a corresponding device is provided. Also provided is an associated operating method and a microlithography projection-exposure system having such a device. The scattered-lighter measuring structure in the illumination mask has a scattered-light marker zone ( 20 a) in the form of a bright-field zone, which on the one hand borders the inner dark-field zone and on the other hand borders an outer dark-field zone, which defines a maximum scattering range. The device may optionally be designed for the multi-channel measuring of scattered light by using a suitable image-field mask and also for multi-channel wavefront measurement, and the detection part may contain an immersion medium. Applications include, for example, the range-resolved determination of scattered light of projection objectives in microlithography projection-exposure systems.