Journal
JOURNAL OF LOW TEMPERATURE PHYSICS
Volume 176, Issue 5-6, Pages 835-840Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-014-1141-5
Keywords
Metal-mesh filters; Infrared rejection; Laser ablation; Millimeter-wave astrophysics
Categories
Funding
- National Science Foundation (NSF) [1056465]
- NSF Graduate Research Fellowship [DGE-114747]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1056465] Funding Source: National Science Foundation
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Ground-based millimeter and sub-millimeter telescopes are attempting to image the sky with ever-larger cryogenically-cooled bolometer arrays, but face challenges in mitigating the infrared loading accompanying large apertures. Absorptive infrared filters supported by mechanical coolers scale insufficiently with aperture size. Reflective metal-mesh filters placed behind the telescope window provide a scalable solution in principle, but have been limited by photolithography constraints to diameters under 300 mm. We present laser etching as an alternate technique to photolithography for fabrication of large-area reflective filters, and show results from lab tests of 500-mm-diameter filters. Filters with up to 700-mm diameter can be fabricated using laser etching with existing capability.
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