Filtration of IR radiation by three-component polymer-crystalline systems |
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Authors: | A D Zamkovets R N Onishchenko |
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Institution: | (1) Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70 F. Skorina Ave., 220072 Minsk, Belarus |
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Abstract: | We have investigated the regularities in forming the spectral characteristic of three-component polymeric-crystalline polytetrafluorethylene-Ge-LiF
interference systems in the wide IR spectral region 0.8–160 μm. The efficiency of suppressing short-wave radiation by structurally
asymmetric imerference systems consisting of polytetrafluorethylene and quasihomogeneous layers with a high refractive index
is shown. Two of this kind of three-layer systems are sufficient for suppressing background radiation within the wavelength
interval from the visible range to ∼35 μm owing to multiple reflection at the boundaries of elementary Ge and LiF layers that
form quasihomogeneous layers (λ ∼ 1.7–17.0 μm) and also due to absorption in the Ge (λ<1.7 μm) and Lif (λ ∼ 17–35 μm) layers.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 67, No_ 3, pp. 379–381, May–June, 2000. |
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Keywords: | interference system spectral characteristic polymer film radiation filtering |
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