[1] [1] L’HUILLIER A, BALCOU P. High-order harmonic generation in rare gases with a 1ps 1053nm laser ［J］. Physical Review Letters, 1993, 70 (6): 774-777.

[2] [2] CORKUM P B. Plasma perspective on strong field multiphoton ionization ［J］. Physical Review Letters, 1993, 71(13): 1994-1997.

[3] [3] LI L, ZHENG M, FENG L Q, et al. Waveform control in generations of intense water window attosecond pulses via multi-color combined field ［J］. International Journal of Modern Physics, 2019, B33(13): 1950130.

[4] [4] LIU H, FENG L Q. Mid-infrared field phase measurement and a-ttosecond pulse generation ［J］. Laser Technology, 2017, 41(2): 151-158 (in Chinese).

[5] [5] LI Y, FENG L Q, QIAO Y. Selective enhancement of single-order and two-order harmonics from He atom via two-color and three-color laser fields ［J］. Chemical Physics, 2019, 527: 110497.

[6] [6] FENG L Q, LI Y, LIU H. High intensity attosecond pulse generation by the improved multi-cycle polarization gating technology ［J］. Laser Technology, 2018, 42(4): 451-456 (in Chinese).

[7] [7] SANSONE G, BENEDETTI E, CALEGARI F, et al. Isolated single-cycle attosecond pulses ［J］. Science, 2006, 314(5798): 443-446.

[8] [8] ZHANG Q B, LU P X, LAN P F, et al. Multi-cycle laser-driven broadband supercontinuum with a modulated polarization gating ［J］. Optics Express, 2008, 16(13): 9795-9803.

[9] [9] LIU H, LI Y, YAO Z, FENG L Q. Chirp pulse control on harmonic cutoff and harmonic intensity ［J］. Laser Technology, 2017, 41(5): 708-711 (in Chinese).

[10] [10] FENG L Q, CHU T S. Generation of an isolated sub-40as pulse using two-color laser pulses: Combined chirp effects ［J］. Physical Review, 2011, A84(5): 053853.

[11] [11] FENG L Q. Molecular harmonic extension and enhancement from H+2 ions in the presence of spatially inhomogeneous fields ［J］. Physical Review, 2015, A92(5): 053832.

[12] [12] FENG L Q, LI Y. Generation of attosecond pulses from He atom driven by UV-chirped laser beam ［J］. Laser Technology, 2019, 43(5): 629-634 (in Chinese).

[13] [13] FENG L Q, CHU T S. Intensity enhancement in attosecond pulse generation ［J］. IEEE Journal of Quantum Electronics, 2012, 48(11): 1462-1466.

[14] [14] FENG L Q, LI Y, MENG F S, et al. High-order harmonic and attosecond pulse generations from Rydberg state driven by the spatially inhomogeneous field ［J］. Modern Physics Letters, 2017, B31(4): 1750029.

[15] [15] LI Y, FENG R L Q, QIAO Y. Improvement of harmonic spectra from superposition of initial state driven by homogeneous and inhomogeneous combined field ［J］. Canadian Journal of Physics, 2020, 98(1): 198-209.

[16] [16] LIU H, LI W L, FENG L Q. Chirp control of multi-photon resonance ionization and charge resonance enhanced ionization on mole-cular harmonic generation ［J］. Chemical Physics Letters, 2017, 676(7): 118-123.

[17] [17] FENG L Q, CHU T S. Nuclear signatures on the molecular harmonic emission and the attosecond pulse generation ［J］. The Journal of Chemical Physics, 2012, 136(5): 054102.

[18] [18] LU R F, ZHANG P Y, HAN K L. Attosecond-resolution quantum dynamics calculations for atoms and molecules in strong laser fields ［J］. Physical Review, 2008, E77(6): 066701.

[19] [19] SONG X H, YANG W F, ZENG Z N, et al. Unipolar half-cycle pulse generation in asymmetrical media with a periodic subwavelength structure ［J］. Physical Review, 2010, A82(5): 053821.

[20] [20] LI Y, FENG L Q. Improvement of harmonic cutoff energy and intensity by using chirped-UV combined field ［J］. Chinese Journal of Quantum Electronics, 2019, 36(6): 738-744 (in Chinese).