1. Laboratory of Nanochemistry Research Institute for Physical Chemical Problems Belarusian State University Leningradskaya str. 14 Minsk 220006 Belarus
2. Department of Glass and Ceramic Technology Belarusian State Technological University Sverdlova str. 13a Minsk 220013 Belarus
3. FZU ‐ Institute of Physics of the Czech Academy of Sciences Cukrovarnická 10/112 162 00 Prague Czech Republic
4. Department of Optical Materials Institute of Physics of the Czech Academy of Sciences Cukrovarnická 10/112 Prague 162 00 Czech Republic
5. Department of Semiconductors FZU ‐ Institute of Physics of the Czech Academy of Sciences Cukrovarnická 10/112 Prague 162 00 Czech Republic
6. Scientific center “Nonlinear Optics and Activated Materials” B. I. Stepanov Institute of Physics 68 Nezavisimosti Avenue Minsk 220072 Belarus