Two-layer anti-reflection coating with mullite and polyimide foam for large-diameter cryogenic infrared filters
arXiv:1607.02938 · doi:10.1364/AO.55.000D22
Abstract
We have developed a novel two-layer anti-reflection (AR) coating method for large-diameter infrared (IR) filters made of alumina, for the use at cryogenic temperatures in millimeter wave measurements. Thermally- sprayed mullite and polyimide foam (Skybond Foam) are used as the AR material. An advantage of the Skybond Foam is that the index of refraction is chosen between 1.1 and 1.7 by changing the filling factor. Combination with mullite is suitable for wide-band millimeter wave measurements with sufficient IR cutoff capability. We present the material properties, fabrication of a large-diameter IR filter made of alumina with this AR coating method, and characterizations at cryogenic temperatures. This technology can be applied to a low-temperature receiver system with a large-diameter focal plane for next-generation cosmic microwave background (CMB) polarization measurements, such as POLARBEAR-2 (PB-2).
9 pages, 10 figures
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Cited by in corpus (6)
- Improving the absolute accuracy of the gravitational wave detectors by combining the photon pressure and gravity field calibrators
- Broadband multi-layer anti-reflection coatings with mullite and duroid for half-wave plates and alumina filters for CMB polarimetry
- Development of epoxy-based millimeter absorber with expanded polystyrenes and carbon black
- Anti-reflection coating with mullite and Duroid for large-diameter cryogenic sapphire and alumina optics
- A Large Diameter Millimeter-Wave Low-Pass Filter Made of Alumina with Laser Ablated Anti-Reflection Coating
- Simons Observatory: Broadband Metamaterial Anti-Reflection Cuttings for Large Aperture Alumina Optics