Method for the protection of an optical element,...

Details Method for the protection of an optical element,... Method for the protection of an optical element,...

2007-05-01

2007-05-01

Wells, Nikita (Department: 2881)

Radiant energy

Irradiation of objects or material

C250S492100

Reexamination Certificate

active

11024011

ABSTRACT:
A method for the protection of an optical element of a lithographic apparatus including the optical element and a source of radiation includes providing a material including one or more elements selected from B, C, Si, Ge and/or Sn, and arranging the material such that the source, in use, causes removal of at least part of the material, thereby providing depositable material, and such that at least part of the depositable material deposits on the optical element.

REFERENCES:
patent: 6359969 (2002-03-01), Shmaenok
patent: 6576912 (2003-06-01), Visser et al.
patent: 2006/0072084 (2006-04-01), Van Herpen et al.

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