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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 9 — Mar. 20, 2014
  • pp: 1727–1733

Cryogenic infrared filter made of alumina for use at millimeter wavelength

Yuki Inoue, Tomotake Matsumura, Masashi Hazumi, Adrian T. Lee, Takahiro Okamura, Aritoki Suzuki, Takayuki Tomaru, and Hiroshi Yamaguchi  »View Author Affiliations


Applied Optics, Vol. 53, Issue 9, pp. 1727-1733 (2014)
http://dx.doi.org/10.1364/AO.53.001727


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Abstract

We propose a high-thermal-conductivity infrared filter using alumina for millimeter-wave detection systems. We constructed a prototype two-layer antireflection-coated alumina filter with a diameter of 100 mm and a thickness of 2 mm and characterized its thermal and optical properties. The transmittance of this filter at 95 and 150 GHz is 97% and 95%, respectively, while the estimated 3 dB cut-off frequency is at 450 GHz. The high thermal conductivity of alumina minimizes thermal gradients. We measure a differential temperature of only 0.21 K between the center and the edge of the filter when it is mounted on a thermal anchor of 77 K. We also constructed a thermal model based on the prototype filter and analyzed the scalability of the filter diameter. We conclude that the temperature increase at the center of the alumina IR filter is less than 6 K, even with a large diameter of 500 mm, when the temperature at the edge of the filter is 50 K. This is suitable for an application to a large-throughput next-generation cosmic-microwave-background polarization experiment such as POLARBEAR-2.

© 2014 Optical Society of America

OCIS Codes
(310.1210) Thin films : Antireflection coatings
(310.6860) Thin films : Thin films, optical properties
(350.2450) Other areas of optics : Filters, absorption
(350.4010) Other areas of optics : Microwaves

ToC Category:
Thin Films

History
Original Manuscript: November 25, 2013
Revised Manuscript: February 2, 2014
Manuscript Accepted: February 3, 2014
Published: March 12, 2014

Citation
Yuki Inoue, Tomotake Matsumura, Masashi Hazumi, Adrian T. Lee, Takahiro Okamura, Aritoki Suzuki, Takayuki Tomaru, and Hiroshi Yamaguchi, "Cryogenic infrared filter made of alumina for use at millimeter wavelength," Appl. Opt. 53, 1727-1733 (2014)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-53-9-1727


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