Optical element and exposure apparatus

An optical element is used for an exposure apparatus which is configured to illuminate a mask with an exposure light beam for transferring a pattern on the mask onto a substrate through a projection optical system and to interpose a given liquid in a space between a surface of the substrate and the...

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Bibliographische Detailangaben
Hauptverfasser: Ishizawa, Hitoshi, Murakami, Atsunobu, Shirai, Takeshi, Kokubun, Takao
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:An optical element is used for an exposure apparatus which is configured to illuminate a mask with an exposure light beam for transferring a pattern on the mask onto a substrate through a projection optical system and to interpose a given liquid in a space between a surface of the substrate and the projection optical system. The optical element includes a first anti-dissolution member provided on a surface of a transmissive optical element on the substrate's side of the projection optical system.