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Large-Area Reflective Infrared Filters for Millimeter/Sub-mm Telescopes

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Abstract

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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  1. 546 Brookton Highway, Roleystone 6111, Western Australia, Tel: +61-8-93976212, Email: orders@eraudio.com.au

  2. 3300 Coffey Lane Santa Rosa, CA 95403, Email: solutions@depsci.com, Tel: +1-707-573-6700

  3. 20312 Gramercy Pl. Torrance, CA 90501, Email: info@laserod.com, Tel: +1-310-328-5869

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Acknowledgments

This material is based upon work supported by the National Science Foundation (NSF) under Grant No. 1056465. J. A. Grayson is supported by an NSF Graduate Research Fellowship under Grant No. DGE-114747.

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Authors and Affiliations

  1. Department of Physics, Stanford University, Stanford, CA, 94305, USA

    Z. Ahmed, J. A. Grayson, K. L. Thompson & C.-L. Kuo

  2. Kavli Institute for Particle Astrophysics and Cosmology, Stanford, CA, 94305, USA

    K. L. Thompson & C.-L. Kuo

  3. Laserod Technologies LLC, Torrance, CA, 90501, USA

    G. Brooks & T. Pothoven

Authors
  1. Z. Ahmed
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  2. J. A. Grayson
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  3. K. L. Thompson
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  4. C.-L. Kuo
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  5. G. Brooks
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  6. T. Pothoven
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Corresponding author

Correspondence to Z. Ahmed.

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Ahmed, Z., Grayson, J.A., Thompson, K.L. et al. Large-Area Reflective Infrared Filters for Millimeter/Sub-mm Telescopes. J Low Temp Phys 176, 835–840 (2014). https://doi.org/10.1007/s10909-014-1141-5

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  • DOI: https://doi.org/10.1007/s10909-014-1141-5

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