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Low-pass interference filters for submillimeter astronomyLow-pass (long-wave transmitting) interference filters, suitable for broadband photometric observations, previously have been constructed from series of capacitive grids stretched on thin Mylar. These filters have the desired optical properties of high transmission, sharp cut-ons, and good blocking at short wavelengths. Their designs, however, do not scale from one wavelength to another and their performance can deteriorate at low temperatures due to differential contraction of the dielectric backing and the supporting structure. The deviation of these early filters from the predicted scaling was due primarily to the difference in refractive index between the backing material and the medium between the grids. In the present paper, filters are described in which dielectric spacers are used, instead of air, as the medium between the grids. This technique has improved the scaling and has reduced the distortion from differential contraction.
Document ID
19800035786
Document Type
Reprint (Version printed in journal)
Authors
Whitcomb, S. E.
(Chicago Univ. Chicago, IL, United States)
Keene, J.
(Chicago, University Chicago, Ill., United States)
Date Acquired
August 10, 2013
Publication Date
January 15, 1980
Publication Information
Publication: Applied Optics
Volume: 19
Subject Category
Instrumentation And Photography
Accession Number
80A19956
Funding Number(s)
CONTRACT_GRANT: NGR-14-001-227
CONTRACT_GRANT: NSG-2057
Distribution Limits
Public
Copyright
Other

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