Projection exposure apparatus and method for measuring a projection lens
Microlithographic projection exposure apparatus (100), having a projection lens (150) for imaging an object plane (155) onto an image plane (156), wherein an immersion liquid is at least temporarily provided during operation of the projection exposure apparatus (100) between the projection lens (150...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | Microlithographic projection exposure apparatus (100), having a projection lens (150) for imaging an object plane (155) onto an image plane (156), wherein an immersion liquid is at least temporarily provided during operation of the projection exposure apparatus (100) between the projection lens (150) and the image plane (156), wherein a measurement structure (121) is arranged in the immersion liquid, wherein the measurement structure (121) is configured to generate a measurement pattern, having a measurement device (130, 160) for measuring the measurement pattern, and wherein the measurement structure (121) has an absorption layer (125) (125) comprising silicon oxide and/or silicon oxynitride and/or nitride. |
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