Patent ID: 11860036
Assignee: CYMER, LLC
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 24:
25. A method for calibrating an etalon during use of the etalon, the method comprising:
receiving data from a detector positioned to sense an interference pattern produced by an etalon that receives a light beam, wherein the interference pattern comprises a plurality of fringes based on the received light beam, and the data comprising first spatial information related to a first of the plurality of fringes and second spatial information related to a second fringe of the plurality of fringes;
accessing a calibration parameter having a pre-set default value;
determining a measurement error value of the etalon based on the first spatial information, the second spatial information, and an initial value of the calibration parameter; and
analyzing the measurement error value to determine whether to adjust the pre-set default value of the calibration parameter during use of the etalon.