Patent ID: 11874525
Assignee: CARL ZEISS SMT GMBH
Field: Optics (Instruments)
Classification: CPC C  G  B | IPC B  C  G

Claim 0:
1. An optical element, comprising:
a substrate comprising a surface; and
an EUV reflective coating supported by the surface,
wherein:
the substrate is monolithic;
the substrate comprises a member selected from the group consisting of fused silica and a glass ceramic;
the substrate comprises a channel configured to have a coolant flow therethrough;
below the surface supporting the EUV reflective coating, the channel has a length that is at least 10 centimeters;
below the surface supporting the EUV reflective coating, the channel has a cross-sectional area that varies by no more than +/−20% over the length of the channel.