1. Lawrence Livermore National Laboratory, 7000 East Ave., Livermore, California 94551, USA
2. Institute of Photonics and Nanotechnology, Vilnius University, Sauletekio av. 3, Vilnius 10257, Lithuania
3. Department of Physics, Belarusian State University, Nezalezhnastsi av. 4, Minsk 220030, Belarus
4. Center for Physical Sciences and Technology, Sauletekio av. 3, Vilnius 10257, Lithuania