Semiconductor Physics, Quantum Electronics & Optoelectronics, 21 (2), P. 173-179 (2018).
DOI: https://doi.org/10.15407/spqeo21.02.173

Large polycrystalline optical germanium Ge:Na plates with improved optical parameters and their application
G.S. Pekar1, A.F. Singaevsky1, M.M. Lokshin1, V.I. Gordienko2, I.V. Mazurin2

1V. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine, 41, prospect Nauky, 03680 Kyiv, Ukraine, E-mail: pekar@isp.kiev.ua, 511alexsin@gmail.com
2State Enterprise Research & Production Complex “Photoprylad”, 85, B. Vyshnevetskoho str., 18001 Cherkasy, Ukraine

Abstract. It has been experimentally shown that transmission and scattering of IR radiation by Na-doped соarse-grained large germanium plates are the same as of Ge:Na single crystals and exceeds the parameters in the commonly used optical germanium Ge:Sb grown from the same raw material. Being based on experimental results, a conclusion has been made that the nature of the dopant in Ge:Na is a decisive factor defining its optical parameters, along with the usual requirements of high purity of the raw material, resistance values below about 20 Ohm·cm and a sufficiently large grain size (for polycrystalline material). It is assumed that, most likely, Na in Ge:Na, contrary to Sb in Ge:Sb, doesn’t form impurity clouds that scatter the incident IR radiation. The advantages of the polycrystalline Ge:Na as a material for IR optics were proved when using it for industrial manufacturing the protective screens for night vision systems.

Keywords: Na-doped germanium, large coarse-grained plates, optical transmission, protective screens, thermal imaging systems.

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