Extended lifetime excimer laser optics

Optical waveguides – Miscellaneous

Reexamination Certificate

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C355S001000

Reexamination Certificate

active

11173455

ABSTRACT:
The invention is directed to hermetically sealed optical lithography components or elements that are hermetically sealed by a durable coat of a hermetically sealing material selected from the group consisting of oxide and fluorinated oxide films. The durable coating of the hermetically sealing material is applied to one of more faces of the optical element, either directly to the face of the element or over a selected coating (for example, an anti-reflective coating) that has been applied to the element. The invention is further directed to a method of making hermetically sealed optical elements.

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patent: 6911283 (2005-06-01), Gordon et al.
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“Development of Low-loss optical coatings for 157nm lithography”R. Biro, et al Optical Micolithography XV, Proceedings of SPIE vol. 4691 2002 pp. 1625-1634.
“Hyper-numbertical aperature imaging challenges for 193nm” Optical Microlithography XVIII, Proceedings of SPIE vol. 5754 pp. 69-79.
“Improvement of the lifetime of the optical coatings under high power laser irradiations” Optical Micorolithography XVIII, Proceedings of SPIE vol. 5754 pp. 1304-1311.
“Surface characterization of Optically Polished CaF2crystal by quasi-Brewster Angle Technique”, Jue Wang, et al, Proceedings of SPIE vol. 5188 pp. 106-114.
“Ambient Effects on the Laser Durability of 157 nm Optical Coatings”, V. Liberman, et al, Optical Micorlithography XVI Proceedings of SPIE vol. 5040 2003 pp. 487-498.
“hetero-opitaxial growth and optical properties of LaF3on CaF2” Taki, et al Thin Solid Films, 420-421 (2002) 30-37.
Prism and Lens Making,F. Twyman, F.R.S., Hilger & Watts. LTD London 2ndEdition, pp. 53-65.

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