Patent ID: 8075732

Claim:
An EUV light producing mechanism for producing EUV light from a laser beam and EUV plasma source material that comprises at least tin, comprising: a tube structure having a first tube end and a second tube end, said second tube end having an opening, said tube structure also having a gas inlet port and a gas outlet port; an optical element disposed at said first tube end, wherein said laser beam passes through said optical element and exiting said opening at said second tube end; an EUV plasma generation chamber disposed outside said tube structure, whereby said laser beam interacts with said EUV plasma source material to produce said EUV light in said EUV plasma generation chamber; and a plasma generation system for producing cleaning plasma within said tube structure from an etchant source gas that enters said gas inlet port, whereby byproducts from generating said cleaning plasma is evacuated from said tube structure via said gas outlet port, said gas outlet port being disposed between said cleaning plasma and said second tube end.