1. Laboratory of Biophotonics, National Research Tomsk State University, Tomsk 634050, Russia
2. V.E. Zuev Institute of Atmospheric Optics SB RAS, Tomsk 634055, Russia
3. Faculty of Information Technology and Electrical Engineering, University of Oulu, 900014 Oulu, Finland
4. College of Engineering and Physical Sciences, Aston University, Birmingham B4 7ET, UK