Patent ID: 9295147
Filing Date: 2016-03-22
CPC Classification: G03F,H01L,H05G,Y10T

Claim Text:
1. An apparatus for generating extreme ultra-violet (EUV) light for use in a lithography mask inspection tool, comprising: a drive laser arranged to produce a laser pulse; a vacuum chamber; a set of focusing optics arranged to focus the laser pulse produced by the drive laser onto a target spot within the vacuum chamber with a beam target diameter of less than 100 μm; a target material generator arranged to deliver a series of droplets of a target material to the target spot within the vacuum chamber by modulating a flow velocity of a first supply of the target material through a nozzle tip and thereby inducing a formation process of the series of droplets of the target material which series of droplets from the nozzle tip are expelled through a triple point chamber; and, a set of collector optics arranged to focus a quantity of EUV light generated when a droplet of the series of droplets of the target material is exposed to the laser pulse at the target spot onto an intermediate focus spot.