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Proceedings Paper

Fabrication and characterization of a NIR-FIR dichroic for the infrared interferometer BETTII
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Paper Abstract

BETTII is a balloon-borne far infrared (FIR: 30-100 μm) interferometer that also uses a near-infrared (NIR: 1-2.5 μm) channel for fine pointing sensing using stars. We have developed an inductive grid dichroic to divide the incoming beam into two components, by reflecting FIR light and transmitting NIR light. The dichroic is fabricated using focused electron beam technology to produce a 1 μm period, 100 nm width metal grid on a sapphire substrate in order to have high reflectance for FIR wavelengths. Here we discuss the design and the detailed manufacturing process for such a dichroic. The transmission and reflectance characteristics are also presented. We discuss them in context of the BETTII requirements.

Paper Details

Date Published: 9 July 2018
PDF: 10 pages
Proc. SPIE 10708, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX, 107083I (9 July 2018); doi: 10.1117/12.2312146
Show Author Affiliations
Arnab Dhabal, NASA Goddard Space Flight Ctr. (United States)
Univ. of Maryland, College Park (United States)
Stephen A. Rinehart, NASA Goddard Space Flight Ctr. (United States)
Robert F. Silverberg, NASA Goddard Space Flight Ctr. (United States)
Dale Fixsen, NASA Goddard Space Flight Ctr. (United States)
John E. Mentzell, NASA Goddard Space Flight Ctr. (United States)
Todd Veach, NASA Goddard Space Flight Ctr. (United States)
Richard Kasica, National Institute of Standards and Technology (United States)
Jessie Zhang, National Institute of Standards and Technology (United States)
Carole Tucker, Cardiff Univ. (United Kingdom)
Peter Ade, Cardiff Univ. (United Kingdom)


Published in SPIE Proceedings Vol. 10708:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX
Jonas Zmuidzinas; Jian-Rong Gao, Editor(s)

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