Patent ID: 9119278
Filing Date: 2015-08-25
Classification: G03F,G21K,H05G

Abstract:
1. A method of generating an extreme ultraviolet light comprising: irradiating a reflective surface on a first one of a plurality of portions of a target material with a first drive laser pulse, wherein the first drive laser pulse passes through an aperture in an extreme ultraviolet collector to the reflective surface of the first portion of the target material; reflecting the first drive laser pulse off the reflective surface of the first portion of the target material wherein the reflected first drive laser pulse passes through the aperture in the extreme ultraviolet collector to an output window of a drive laser; reflecting the reflected first drive laser pulse off of the output window of the drive laser to a detector; detecting the reflected first drive laser pulse in the detector; determining a location of the first portion of the target material based on the detected reflection; outputting the location of the first portion of the target material to a controller, the controller including logic on a computer readable medium for adjusting a location of a second one of the plurality of portions of the target material to a waist of a focused drive laser; and irradiating the second one of the plurality of portions of the target material with a second drive laser pulse.