[1] Chessa P, Wispelaere E D, Dorchies F, et al. Temporal and angular resolution of the ionization-induced refraction of a short laser pulse in Helium gas. Phys Rev Lett,1999,82(3): 552~555
[2] Nikitin S P, Yuelin L, Antonsen T M, etal. Ionizationinduced pulse shortening and retardation of high intensity femtosecond laser pulses. Opt Commun, 1998,157 (1-6):139~144
[3] Alexeev I, Antonsen T M, Kim K Y, et al. Selffocusing of intense laser pulses in a clustered gas. Phys Rev Lett, 2003,90(10): 103402
[4] Brabec T, Krausz F. Nonlinear optical pulse propagation in the single-cycled regime. Phys Rev Lett, 1997, 78(17): 3282~3285
[5] Geissler M, Tempea G, Scrinzi A, et al. Ligtht propagating in field-ionizing media: extreme nonlinear optics. PhysRevLett, 1999,83(15): 2930~2934
[6] Corkum P B, Burnett N H, Brunel F. Above-threshold ionization in the long-wavelength limit. Phys Rev Lett,1989,62(11): 1259~1262
[7] Ditmire T, Donnelly T, Rubenchik A M, et al.Interaction of intense laser pulses with atomic clusters.Phys Rev A, 1996, 53(5): 3379~3402