1. Vilnius University, Faculty of Physics, Laser Research Center, Sauletekio Ave. 10, Vilnius, Lithuania
2. Center for Physical Sciences and Technology, Savanoriu Ave. 231, LT-02300 Vilnius, Lithuania
3. TOBB University of Economics and Technology, Söğütözü Str. 43, 06510, Ankara, Turkey
4. ICREA, Passeig Lluís Companys 23, 08010, Barcelona, Spain
5. UPC, Dep. de Fisica, Rambla Sant Nebridi 22, 08222, Terrassa (Barcelona) Spain