Patent ID: 9715180
Date: 2017-07-25
CPC Classifications: G03F

Claim:
1. A photolithography method comprising: instructing an optical source to produce a pulsed light beam; scanning the pulsed light beam across a wafer of a lithography exposure apparatus to expose the wafer with the pulsed light beam; detecting a property of the pulsed light beam at the wafer as the pulsed light beam is scanned across the wafer; during scanning of the pulsed light beam across the wafer, receiving the property of the pulsed light beam at the wafer; determining a value of a physical property of a wafer that correlates with the received pulsed light beam property by selecting the value of the physical property of the wafer based on the received pulsed light beam property; determining a modification to a performance parameter of the pulsed light beam based on the pulsed light beam property that is received during scanning and the determined value of the wafer physical property; and modifying the performance parameter of the pulsed light beam during scanning across the wafer based on the determined modification.