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US 12,618,138 B2Granted
Anti-reflective coatings for IR-transmitting substrates
AssigneeCorning Incorporated
InventorsNicholas Levi Bredberg, Lance Changyong Kim, Yongli Xu
Life of this patent
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Abstract
Optical elements including YbF3 layers with high transmittance in the LWIR spectral range are described. The YbF3 layer is produced by an ion-assisted deposition process under high voltage conditions. Dense, uniform, and nearly defect-free YbF3 layers are formed. The improved material quality of the YbF3 layers leads to low absorption in the LWIR spectral range, especially at wavelengths above 10.0 microns. The extinction coefficient of the YbF3 layers is less than 0.0400 at a wavelength of 13.5 microns.
Claims15
An optical element comprising:
- a substrate;
- and
- a coating in contact with the substrate, the coating comprising a layer of YbF3, the layer of YbF3 having an absorption less than 2.2%/micron at a wavelength of 13.5 microns.
Dependencies are inferred from the claim text.