[1] Russian Acad Sci, AM Prokhorov Gen Phys Inst, Fibre Opt Res Ctr, Moscow 119991, Russia
[2] Fianium New Opt Ltd, Southampton, Hants, England
[3] MF Stelmakh Polyus Res & Dev Inst, Moscow, Russia
[4] Milon Laser, St Petersburg, Russia
[5] Russian Acad Sci, Inst Chem High Pur Subst, Nizhnii Novgorod 603600, Russia