1. Department of Optics, Palacký University, 17. listopadu 1192/12, 771 46 Olomouc, Czech Republic
2. Institute of Physical Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2, 616 69 Brno, Czech Republic
3. Central European Institute of Technology, Brno University of Technology, Purkyňova 656/123, 612 00 Brno, Czech Republic