Arrest of self-focusing collapse in femtosecond air filaments: higher order Kerr or plasma defocusing? Kosareva, Olga ; Daigle, Jean-Francois ; Panov, Nikolay ; Wang, Tiejun ; Hosseini, Sima ; Yuan, Shuai ; Roy, Gilles ; Makarov, Vladimir ; Leang Chin, See Abstract Publication: Optics Letters Pub Date: April 2011 DOI: 10.1364/OL.36.001035 Bibcode: 2011OptL...36.1035K