Computer Science
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985rpeee.......58g&link_type=abstract
In its USSR Report: Electronics and Electrical Engineering (JPRS-UEE-85-011) p 58-59 (SEE N86-15484 06-31) Transl. into ENGLI
Computer Science
Coefficients, Energy Gaps (Solid State), Energy Spectra, Eutectic Alloys, Optical Filters, Refractivity, Temperature Dependence, Cadmium Selenides, Heat Treatment, Infrared Windows, Mercury Alloys, Spectrum Analysis, Thermal Expansion, Transmission Lines
Scientific paper
The two compounds CdSe and HgSe form pseudobinary alloys Cd sub x Hg sub 1 - x Se whose energy gap and refractive index depend on the composition and the temperature. The filter properties of these materials were measured in an experimental study, to determine the suitability of such filters for matching infrared devices with the window in the atmosphere. Their transmission spectra, wavelength dependence of the transmission coefficient over the 2 to 8 micrometer range, were measured at 300 K and at 80 K. They were also measured before and after heat treatment at 200 C for 50 h in vacuum or in mercury vapor as well as before and after clearing with SiO. The data yield the basic filter characteristics, namely the maximum transmission coefficient and the corresponding wavelength in a peaking spectrum or wavelength range in a flat spectrum. The data are also useful for stoichiometric control of the transmission band as well as the transmission level. The transmission coefficient increases with an increase of the cadmium content owing to an increase of the energy gap which in this system varies from 0 to 1.8 eV. Annealing in vacuum increases the transmission coefficient at the long-wave end and decreases the slope of the short-wave edge, annealing in mercury vapor having a similar effect on the short-wave edge.
Antoshchuk V. G.
Gavaleshko N. P.
Paranchich L. D.
Paranchich Yu. S.
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