1. Photonics Group, Institute of Physics, Lodz University of Technology, ul. Wólczanska 219, 90-924 Łódz, Poland
2. Vigo Photonics S.A., ul. Poznanska 129/133, 05-850 Ozarów Mazowiecki, Poland
3. Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland