Patent ID: 8927952
Filing Date: 2015-01-06
Classification: G03F,G21K,H05G

Abstract:
1. A method of generating extreme ultraviolet (EUV) light, the method comprising: directing a first pulse of radiation toward an initial target that comprises target material that emits EUV light when converted to plasma to form a modified target, the modified target comprising a different geometric distribution of target material than the initial target; directing a second pulse of radiation toward the modified target to form a target; and directing an amplified light beam toward the target, the amplified light beam comprising an energy sufficient to convert at least a portion of the target to a plasma that emits EUV light and the amplified light beam and the second pulse of radiation being separated in time by a delay time that is between 1 and 200 nanoseconds (ns), wherein the target material comprises tin.