D. A. Lovcov - Dr.Sc. (Eng.), Professor, Lebedev Institute of Precision Mechanics and Computer Engineering, Russian Academy of Sciences (IPMCE) E-mail: dal@ipmce.ru G. I. Andreev - Post-graduate Student, Lebedev Institute of Precision Mechanics and Computer Engineering, Russian Academy of Sciences (IPMCE) E-mail: andreeffgena@gmail.com V. V. Letunov - Post-graduate Student, Lebedev Institute of Precission Mechanics and Computer Engineering, Russian Academy of Sciences (IPMCE) E-mail: vladimirletunov@yandex.ru