Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials
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Temperature dependence of optical transmission of germanium single crystals

A.I. Ivanova, K.A. Marinicheva, S.A. Tret'yakov, A.M. Ivanov, S.V. Molchanov, I.A. Kaplunov

Tver State University

DOI: 10.26456/pcascnn/2021.13.177

Original article

Abstract: In this work, we investigated optical transmission in the wavelength range of 2—14 µm of low-resistance germanium crystals (1—3 Ω·cm) doped with donor and acceptor impurities in the temperature range from 86K to 523 K. The values of the attenuation coefficients for investigated crystals are obtained. Minimum attenuation coefficients α of 0,0015—0,0231 cm-1 in the temperature range from 86K to 323K are characteristic for germanium single crystals doped with antimony in the range 2,1—11 μm. Studies have shown that the low values of α and the transmittance τ at a wavelength of 3,39 μm for Ge:Bi and Ge:Sb crystals make it possible to use these low-resistance germanium crystals for gas helium-neon lasers at temperatures from 86K to 323K. The temperature changes in the geometry of the crystal surface are investigated at the nanoscale level. It is shown that heating crystalline germanium leads to an increase in the diffuse reflection of radiation from the surface. The possibility of using the low-resistance germanium crystals doped with antimony as elements of infrared optics in the temperature range 86—373 K has been demonstrated.

Keywords: germanium single crystals, temperature stability, optical transmission, attenuation coefficient, surface nanorelief, diffuse reflection

  • Alexandra I. Ivanova – Ph. D., Docent, Applied Physics Department, Tver State University
  • Kristina A. Marinicheva – Lead Engineer, Applied Physics Department, Tver State University
  • Sergey A. Tret'yakov – Ph. D., Docent, Applied Physics Department, Tver State University
  • Aleksey M. Ivanov – Lead Programmer, Applied Physics Department, Tver State University
  • Sergey V. Molchanov – 3rd year postgraduate student, Applied Physics Department, Tver State University
  • Ivan A. Kaplunov – Dr. Sc., Professor, Head of the Applied Physics Department, Tver State University

Reference:

Ivanova, A.I. Temperature dependence of optical transmission of germanium single crystals / A.I. Ivanova, K.A. Marinicheva, S.A. Tret'yakov, A.M. Ivanov, S.V. Molchanov, I.A. Kaplunov // Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials. – Tver: TSU, 2021. — I. 13. — P. 177-186. DOI: 10.26456/pcascnn/2021.13.177. (In Russian).

Full article (in Russian): download PDF file

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