Method of determining lens materials for a projection...

Details Method of determining lens materials for a projection... Method of determining lens materials for a projection...

2007-07-03

2007-07-03

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

C359S649000, C359S896000

Reexamination Certificate

active

11181694

ABSTRACT:
A method of determining materials of lenses contained in an optical system of a projection exposure apparatus is described. First, for each lens of a plurality of the lenses, a susceptibility factor KLT/LHis determined. This factor is a measure of the susceptibility of the respective lens to deteriorations caused by at least one of lifetime effects and lens heating effects. Then a birefringent fluoride crystal is selected as a material for each lens for which the susceptibility factor KLT/LHis above a predetermined threshold. Theses lenses are assigned to a first set of lenses. For these lenses, measures are determined for reducing adverse effects caused by birefringence inherent to the fluoride crystals.

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