[1] D′mico C, Houard A, Franco M, et al. Conical forward THz emission from femtosecond-laser-beam filamentation in air [J]. Physical Review Letters, 2007, 98(23): 235002.

[2] Liu J, Dai J, Chin S L, et al. Broadband terahertz wave remote sensing using coherent manipulation of fluorescence from asymmetrically ionized gases [J]. Nature Photonics, 2010, 4(9): 627-631.

[3] You Y S, Oh T I, Kim K Y. Off-axis phase-matched terahertz emission from two-color laser-induced plasma filaments[J]. Physical Review Letters, 2012, 109(18): 183902.

[4] Zhang Y, Chen Y, Marceau C, et al. Non-radially polarized THz pulse emitted from femtosecond laser filament in air [J]. Optics Express, 2008, 16(20): 15483-15488.

[5] Xu S, Sun X, Zeng B, et al. Simple method of measuring laser peak intensity inside femtosecond laser filament in air [J]. Optics Express, 2012, 20(1): 299-307.

[6] Zeng B, Chu W, Gao H, et al. Enhancement of peak intensity in a filament core with spatiotemporally focused femtosecond laser pulses[J]. Physical Review A, 2011, 84(6): 063819.

[7] Feng S, Winful H G. Physical origin of the Gouy phase shift [J]. Optics Letters, 2001, 26(8): 485-487.

[8] Dai J, Zhang J, Zhang W, et al. Terahertz time-domain spectroscopy characterization of the far-infrared absorption and index of refraction of high-resistivity, float-zone silicon [J]. Journal of the Optical Society of America B, 2004, 21(7): 1379-1386.

[9] Houard A, Liu Y, Prade B, et al. Strong enhancement of terahertz radiation from laser filaments in air by a static electric field[J]. Physical Review Letters, 2008, 100(25): 255006.