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Proceedings Paper

Cooled optical filters for Q-band infrared astronomy (15-40 μm)
Author(s): Gary J. Hawkins; Richard E. Sherwood; Karim Djotni; Timothy M. Threadgold
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Paper Abstract

With a growing interest in mid- and far-infrared astronomy using cooled imaging and spectrometer instruments in highaltitude observatories and spaceflight telescopes, it is becoming increasingly important to characterise and assess the spectral performance of cooled multilayer filters across the Q-band atmospheric window. This region contains spectral features emitted by many astrophysical phenomena and objects fundamental to circumstellar and planetary formation theories. However extending interference filtering to isolate radiation at progressively longer wavelengths and improve photometric accuracy is an area of ongoing and challenging thin-film research. We have successfully fabricated cooled bandpass and edge filters with high durability for operation across the 15-30 μm Q-band region. In this paper we describe the rationale for selection of optical materials and properties of fabricated thin-film coatings for this region, together with FTIR spectral measurements and assessment of environmental durability.

Paper Details

Date Published: 22 July 2016
PDF: 11 pages
Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 991235 (22 July 2016); doi: 10.1117/12.2231669
Show Author Affiliations
Gary J. Hawkins, The Univ. of Reading (United Kingdom)
Richard E. Sherwood, The Univ. of Reading (United Kingdom)
Karim Djotni, The Univ. of Reading (United Kingdom)
Timothy M. Threadgold, The Univ. of Reading (United Kingdom)


Published in SPIE Proceedings Vol. 9912:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
Ramón Navarro; James H. Burge, Editor(s)

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