Patent ID: 8669542
Filing Date: 2014-03-11
Classification: G03F,G21K,H05G

Abstract:
1. An extreme ultraviolet light source apparatus for supplying extreme ultraviolet light to a processintg unit for performing processing by using the extreme ultraviolet light, said apparatus comprising: a chamber in which the extreme ultraviolet light to be supplied to said processing unit is generated; a collector mirror provided in said chamber, and configured to collect the extreme ultraviolet light generated in said chamber and to output the extreme ultraviolet light from said chamber; and an optical path connection module arranged at a position between said chamber and said processing unit, and configured to be detachable from the position, to isolate a route of the extreme ultraviolet light between said chamber and said processing unit from outside, and to form, in the optical path connection module, an intermediate focusing point of the extreme ultraviolet light from the chamber, wherein said optical path connection module includes a diaphragm part configured to pass the extreme ultraviolet light generated in said chamber, said optical path connection module includes an exhaust route on a wall of at least one of said chamber side and said processing unit side seen from said diaphragm part, the extreme ultraviolet light source apparatus further comprises a spectral purity filter provided in the route of the extreme ultraviolet light within said optical path connection module, and said exhaust route is located between said spectral purity filter and said diaphragm part.