Affiliation: | (1) Institute of Problems of Laser and Information Technologies, Russian Academy of Sciences, Troitsk, Russia;(2) Saratov State University, 155 Moskovskaya Str., Saratov, 410026, Russia;(3) Scientific Center of Fiber Optics, Russian Academy of Sciences, Moscow, Russia;(4) Polyclinic No. 1, Administration of the President of the Russian Federation, Moscow, Russia |