A. R. Baev
Institute of Applied Physics of the National Academy of Science of Belarus
Belarus

Address for correspondence: - Baev A.R. – Institute of Applied Physics of the National Academy of Science of Belarus, Akademicheskaya str., 16, Minsk 220072, Belarus
e-mail: baev@iaph.bas-net.by

N. V. Levkovitch
Belarusian State Univercity
Belarus

Nezavisimosti Ave., 4, Minsk 220030, Belarus

M. V. Asadchaya
Institute of Applied Physics of the National Academy of Science of Belarus
Belarus

 Akademicheskaya str., 16, Minsk 220072

A. L. Mayorov
Institute of Applied Physics of the National Academy of Science of Belarus
Belarus

 Akademicheskaya str., 16, Minsk 220072

G. I. Razmyslovich
Институт прикладной физики Национальной академии наук Беларуси
Belarus

 Akademicheskaya str., 16, Minsk 220072

A. Y. Burnos
Institute of Applied Physics of the National Academy of Science of Belarus
Belarus

 Akademicheskaya str., 16, Minsk 220072