Optical transmission of IR radiation by coarse-grained Ge:Na plates is the same as in Ge:Na
single crystals and is higher than in Ge:Sb crystals
High optical transmission of crystalline Ge:Na is due to the absence of impurity clouds that could scatter the incident IR radiation
The advantages of polycrystalline Ge:Na as a material of IR optics have been confirmed in the process of its industrial application
Semiconductor Physics, Quantum Electronics & Optoelectronics, 21 (2), P. 173-179 (2018).
Large polycrystalline optical germanium Ge:Na plates with improved
optical parameters and their application
1V. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine,
41, prospect Nauky, 03680 Kyiv, Ukraine,
E-mail: firstname.lastname@example.org, email@example.com
Abstract. It has been experimentally shown that transmission and scattering of IR radiation by Na-doped ÑĞ¾arse-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 OhmÂ·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, doesnât 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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