Changes in the multilayer dielectric coating reflection coefficient change under variations in the medium humidity
L.N. Sinitsa, A.A. Lugovskoi, V.I. Serdyukov, M.Yu. Arshinov
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634055, Russia
Keywords: вода, коэффициент отражения, диэлектрическое покрытие, нанопоры, water, reflection coefficient, dielectric mirrors, nanopores
Subsection: SPECTROSCOPY OF AMBIENT MEDIUM
Abstract
It was found that the reflection coefficient of multilayer dielectric mirrors strongly depends on the medium (gas sample) humidity. This effect can lead to both an increase and a decrease in the reflection coefficient, which is determined by the change in the dielectric layer refractive indices (when filled with water vapor). The mirror reflection coefficient can increase up to 0.9% in a gas with a humidity close to the dew point. Changes in the reflection coefficient of a mirror in gas media containing different isotopes of water vapor H216O, H218O, and D2O are studied. Mirrors of the CRDS spectrometers with a reflection coefficient R = 0.9999 were studied and the upper bound of the effect was estimated.
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