Apparatus for generating light in the extreme ultraviolet and use in a light source for extreme ultraviolet lithography

摘要

The device comprises a device ( 2 ) for creating an essentially linear target ( 4 ) in an evacuated space where laser beams ( 1 ) are focused, the target being suitable for interacting with the focused laser beams ( 1 ) to emit a plasma emitting radiation in the extreme ultraviolet. A receiver device ( 3 ) receives the target ( 4 ) after it has interacted with the focused laser beams ( 1 ), and a collector device ( 110 ) collects the EUV radiation emitted by the target ( 4 ). The focusing elements ( 11 ) for focusing the laser beams on the target ( 4 ) are arranged in such a manner that the laser beams ( 1 ) are focused on the target ( 4 ) laterally, being situated in a common half-space relative to the target ( 4 ) and being inclined at a determined angle lying in the range about 60° to about 90° relative to a mean collection axis ( 6 ) perpendicular to the target ( 4 ). The collector device ( 110 ) is disposed symmetrically about the mean collection axis ( 6 ) in the half-space containing the laser beams ( 1 ) focused on the target ( 4 ) and inside a conical space ( 8 ) centered on the mean collection axis ( 6 ) with a vertex situated at the target ( 4 ) and a half-angle at the vertex that is less than the angle of inclination of the focused laser beams ( 1 ) relative to the mean collection axis ( 6 ). The device is suitable for use as a source for EUV radiation in lithography for fabricating integrated circuits.