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

A. V. Vorobei
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

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

Akademicheskaya str., 16, Minsk 220072

N. V. Delenkovsky
Institute of Applied Physics of the National Academy of Science of Belarus
Belarus

Akademicheskaya str., 16, Minsk 220072