[1] LIU W J,LI H J,QU Sh L,et al.Femtosecond pulse compre-ssion in external cavity[J].Laser Technology,2007,31(6):665-667(in Chinese).
[2] SHI L P,LI W X,WANG Y D,et al.Generation of high-density electrons based on plasma grating induced Bragg diffraction in air[J].Physics Review Letters,2011,107(9):095004.
[3] YIN F,TAO X Y.Acceleration of relativistic electrons in Gaussian laser electromagnetic field[J].Laser Technology,2011,35(3):384-387(in Chinese).
[4] CHIN S L,HOSSEINI S A,LIU W,et al.The propagation of powerful femtosecond laser pulses in optical media:physics,applications,and new challenges[J].Canadian Journal of Physics,2005,83(9):863-905.
[5] SHENG Z M,ZHANG J,UMSTADTER D.Plasma density gratings induced by intersecting laser pulses in underdense plasmas[J].Journal of Applied Physics,2003,B77(6/7):673-680.
[6] CORKUM P B,ROLLAND C.Supercontinuum generation in gases[J].Physics Review Letters,1986,57(18):2268-2271.
[7] NIBBERING E T J,CURLEY P F,GRILLON G,et al.Conical emission from self-guided femtosecond pulses in air[J].Optics Letters,1996,21(1):62-65.
[8] STRICKLAND D,MOUROU G.Compression of amplified chirped optical pulses[J].Optics Communications,1985,56(3):219-221.
[9] LIU X L,SUN Sh H,REN Zh G,et al.Micro-displacement measurement system of pulse equivalent and return difference of a stepping motor[J].Laser Technology,2011,35(5):603-605(in Chinese).
[10] KASPARIAN J,SAUERBREY R,CHIN S L.The critical laser intensity of self-guided light filaments in air[J].Journal of Applied Physics,2000,B71(6):877-879.
[11] KOSAREVA O G,LIU W,PANOV N A,et al.Can we reach very high intensity in air with femtosecond PW laser pulses[J].Laser Physics,2009,19(8):1776-1792.