[1] [1] X. F. Li, A. L′Huillier, M. Ferray et al.. Multiple-harmonic generation in rare gases at high laser intensity. Physics. Rev. A, 1989,39(11):5751～5761

[2] [2] P. Sprangle, E. Esarey, A. Ting. Nonlinear theory of intense laser-plasma interactions. Phys. Rev. Lett., 1990,64(17):2011～2014

[3] [3] D. V. Korobkin, C. H. Nam, S. Suckewer et al.. Demonstration of soft X-ray lasing to ground state in LiIII. Phys. Rev. Lett., 1996,77(26):5206～5209

[4] [4] J. C. Kieffer, M. Chaker, J. P. Matte et al.. Ultrafast X-ray sources. Phys. Fluids B, 1993,5(7):2676～2681

[5] [5] K. Burnett, V. C. Reed, P. L. Knight. Atoms in ultra-intense laser fields. J. Phys. B: At. Mol. Opt. Phys., 1993, 26(4):561～598

[6] [6] S. C. Wilks, W. L. Kruer, B. Hammel et al.. Ultra-intense, short pulse laser-plasma interactions with applications to advanced fusion concepts. 12th International Conference on Laser Interaction and Related Plasma Phenomena, Oasak, Japan, 1995, April 24～28

[7] [7] B. Luther-Davies, E. G. Gamalii, Y. Wang et al.. Matter in ultrastrong laser fields. Sov. J. Quantum Electron., 1992,22(4):289～325

[8] [8] S. G. Prestou, M. Zepf, A. Sanpera et al.. Generation of high harmonics on the sprite CPA laser system. RAL Annual Report, 1994～1995

[9] [9] R. C. Elton. X-ray Laser. 1990 by Academic Press, Inc.

[10] [10] K. Eidmann, T. Kishimoto. Absolutely measured X-ray spectra from laser plasmas with targets of different elements. Appl. Phys. Lett., 1986,49(7):377～378