Patent ID: 11892779
Assignee: ASML HOLDING N.V.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 15:
16. A non-transitory computer-readable media comprising instructions therein, the instructions, when executed by one or more processors, configured to cause at least:
delivery, via a pump, of a fluid as a heat transfer medium into a set of closed channels of an optical element having a curved surface;
receipt, via a temperature sensor, of temperature values across the curved surface, or receipt, via a model, of a heat distribution across the curved surface; and
control, based on the temperature values or the heat distribution, of a property of the fluid to maintain a uniform temperature distribution across the curved surface during imaging using the optical element, wherein the control comprises: determination of a location on the curved optical surface having relatively high temperature values; identification of one or more closed channels of the set of closed channels that are nearest to the determined location; and adjustment of the property of the fluid within the one or more closed channels so that temperature at the determined locations is maintained within a desired temperature range,
wherein regions at a heat transfer surface of the optical element that are exposed to the set of closed channels are positioned along a curved profile similar to that of the curved surface.