S.V. Kuzikov – Head of Laboratory, Institute of Applied Physics of RAS (N. Novgorod) E-mail: kuzikov@appl.sci-nnov.ru

Yu.V. Rodin – Leading Engineer, Institute of Applied Physics of RAS (N. Novgorod)

E-mail: wish26@yandex.ru

A.A. Vikharev – Research Scientist, Institute of Applied Physics of RAS (N. Novgorod) E-mail: alvikharev@appl.sci-nnov.ru