Lithographic apparatus and monitoring method
First Claim
1. A lithographic apparatus comprising a radiation beam monitoring apparatus, the radiation beam monitoring apparatus comprising an optical element configured to generate a diffraction pattern, and an imaging detector located after the optical element and not in a focal plane of the optical element such that the imaging detector is capable of detecting a mixture of spatial coherence and divergence of a radiation beam of the lithographic apparatus.
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Accused Products
Abstract
A lithographic apparatus including a radiation beam monitoring apparatus, the radiation beam monitoring apparatus including an optical element configured to generate a diffraction pattern, and an imaging detector located after the optical element and not in a focal plane of the optical element such that the imaging detector is capable of detecting a mixture of spatial coherence and divergence of the radiation beam.
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Citations
17 Claims
- 1. A lithographic apparatus comprising a radiation beam monitoring apparatus, the radiation beam monitoring apparatus comprising an optical element configured to generate a diffraction pattern, and an imaging detector located after the optical element and not in a focal plane of the optical element such that the imaging detector is capable of detecting a mixture of spatial coherence and divergence of a radiation beam of the lithographic apparatus.
- 14. A monitoring method comprising using an optical element and an imaging detector which is not located in a focal plane of the optical element to obtain an image of a radiation beam of a lithographic apparatus, the image providing information relating to a mixture of spatial coherence and divergence of the radiation beam.
Specification