Patent ID: 9588430
Date: 2017-03-07
CPC Classifications: B05B,G03F,H05G,H05H

Claim:
1. A method of compensating for push-out from a primary focal spot at which sequential target material droplets from a droplet generator are to be lased during burst-firing of an extreme ultraviolet laser light source, the laser light source containing a feed-forward mechanism for correcting for droplet-to-droplet changes in axial position, comprising: sensing a plurality of droplets during a burst, the droplets directed toward an initial target position; calculating an axial position for each of the sensed droplets; determining an inverse of each of the calculated axial positions; updating target positions to be the determined inverse of each of the calculated axial positions; and commanding one or more actuators to reposition the droplet generator to deliver, during the burst, droplets of target material to the updated target positions.