[1] Sprangle P, Esarey E, Krall J. Self-guiding and stability of intense optical beams in gases undergoing ionization. Phys. Rev. (E), 1996, 54(4):4211～4232
[2] Marburger J H. Self-focusing: Theory. Prog. Quant. Electron., 1975, 4(1):35～110
[3] Perry M D, Landen O L, Szoke A et al.. Multiphoton ionization of the noble gases by an intense 1014 W/cm2 dye laser. Phys. Rev. (A), 1988, 37(3):747～760
[4] Feit M D, Fleck Jr J A. Effect of refraction on spot-size dependence of laser-induced breakdown. Appl. Phys. Lett., 1974, 24(4):169～172
[5] Durfee Ⅲ C G, Lynch J, Milchberg H M. Development of a plasma waveguide for high-intensity laser pulses. Phys. Rev. (E), 1995, 51(3):2368～2389
[6] Nibbering E T J, Gurley P F, Grillon G et al.. Conical emission from self-guided femtosecond pulses in air. Opt. Lett., 1996, 21(1):62～64
[7] Braun A, Korn G, Liu Xi et al.. Self-channeling of high-peak-power femtosecond laser pulses in air. Opt. Lett., 1995, 20(1):73～75
[8] Kosareva O G, Brodeur A, Kandiov V P et al.. Conical emission from laser-plasma interactions in the filamentation of powerful ultrashort laser pulses in air. Opt. Lett., 1997, 22(17):1332～1334
[9] Fontaine B L, Jiang Z, Mercure H P et al.. Filamentation of ultrashort pulse laser beams resulting from their propagation over long distances in air. Phys. Plasmas, 1999, 6(5):1615～1621
[10] Mlejnek M, Wright E M, Moloney J V. Dynamic spatial replenishment of femtosecond pulses propagating in air. Opt. Lett., 1998, 23(5):382～384
[11] Brodeur A, Chien C Y, Kosareva O G et al.. Moving focus in the propagation of ultrashort laser pulses in air. Opt. Lett., 1997, 22(5):304～306
[12] Mlejnek M, Wright E M, Moloney J V. Femtosecond pulse propagation in argon: A pressure dependence study. Phys. Rev. (E), 1998, 58(4):4903～4910
[13] Mlejnek M, Kolesik M, Moloney J V et al.. Optically turbulent femtosecond light guide in air. Phys. Rev. Lett., 1999, 83(15):2938～2941
[14] Keldysh L V. Ionization in the field of a strong electromagnetic wave. Sov. Phys. JETP, 1965, 20(5):1037～1049
[15] Campillo A J, Shapiro S L, Suydam B R. Periodic breakup of optical beams due to self-focusing. Appl. Phys. Lett., 1973, 23(11):628～630
[16] Mlejnek M, Wright E M, Moloney J V. Moving-focus versus self-waveguiding model for long-distance propagation of femtosecond pulses in air. IEEE J. Quant. Electron., 1999, QE-35(12):1771～1776
