Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980spie..253..266s&link_type=abstract
In: Modern utilization of infrared technology VI; Proceedings of the Seminar, San Diego, CA, July 31, August 1, 1980. (A81-39621
Astronomy and Astrophysics
Astronomy
Bandpass Filters, Cryogenic Cooling, Far Infrared Radiation, Infrared Astronomy, Infrared Filters, Interference, Thin Films, Cadmium Selenides, Coatings, Dielectrics, Infrared Spectrometers, Lead Tellurides, Semiconducting Films, Structural Design, Substrates, Zinc Sulfides
Scientific paper
A description is presented of technological advances related to thin-film filters which are being developed to overcome filtering problems in far-infrared (FIR) astronomy. The dielectric thin-film technique relying on the interference principle has been extended to FIR filters working at 4 K. Absorption in the region from 16.5 to 21.5 micrometers has precluded Ge or Si substrates. Satisfactory adhesion has been obtained on CdTe. This material is usable to 50 micrometers when cold. An employment of CdTe for these wavelengths is currently necessary because of present adhesion difficulties concerning Si. Attention is given to the choice of FIR coating materials, substrates, manufacturing problems, questions of coating design, and the observed performance of ZnS films and CdSe/PbTe filters.
Hunneman Roger
Seeley J. S.
Whatley A.
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