Cooled Filters 16-42µm Wavelength For FIR Astronomy
J S Seeley, R Hunneman, A Whatley
SPIE Proceedings, 253, Pages 266-273 (1980)
The design and manufacture of dielectric-film interference filters for cooled FIR astronomy is described. The bands are 16.5-21.5µm, 17.5-19.5µm, 19.5-21.5µm and 27µm cut on. The films are PbTe/CdSe and the substrates are CdTe (some 1/2 mm thick), without absorption in the region: KRS-6 films are used for antireflection.