1. Ioffe Institute, St. Petersburg 194021, Russia
2. ITMO University, St. Petersburg 199034, Russia
3. St. Petersburg State University, St.
Petersburg 198504, Russia
4. Institute of Silicate Chemistry of RAS, St.
Petersburg 199034, Russia
5. NITIOM SI Vavilov State Opt Inst, 36-1 Ul Babushkina, St.
Petersburg 192171, Russia
6. Department
of Physics, Jackson State University, Jackson, Mississippi 39217, United States