[1] Moscow MV Lomonosov State Univ, Ctr Int Laser, Dept Phys, Moscow 119992, Russia
[2] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA
[3] Russian Quantum Ctr, Skolkovo 143025, Moscow Region, Russia
[4] Russian Acad Sci, PN Lebedev Phys Inst, Moscow 119991, Russia
[5] Natl Acad Sci Belarus, BI Stepanov Phys Inst, Minsk, BELARUS
[6] Princeton Univ, Princeton, NJ 08544 USA
[7] Kurchatov Inst, Natl Res Ctr, Moscow 123182, Russia