[1] Krausz F, Ivanov M. Attosecond physics[J]. Reviews of Modern Physics, 81, 163-234(2009).

[2] Vampa G. McDonald C R, Orlando G, et al. Theoretical analysis of high-harmonic generation in solids[J]. Physical Review Letters, 113, 073901(2014).

[3] Zhai C, Zhu X, Lan P et al. Diffractive molecular-orbital tomography[J]. Physical Review A, 95, 033420(2017).

[4] Zheng X X, Bai L H, Feng F Z. Non-sequential double ionization of magnesium atom in elliptically polarized strong laser field[J]. Laser & Optoelectronics Progress, 54, 080201(2017).

[5] Su J H, Lü N, Ge J M. Characteristics of plasma shock waves in laser-induced film damage[J]. Chinese Journal of Lasers, 43, 1203003(2016).

[6] McPherson A, Gibson G, Jara H et al. . Studies of multiphoton production of vacuum-ultraviolet radiation in the rare gases[J]. Journal of the Optical Society of America B-Optical Physics, 4, 595-601(1987). http://onlinelibrary.wiley.com/resolve/reference/ADS?id=1987JOSAB...4..595M

[7] L'Huillier A. Schafer K J, Kulander K C. Theoretical aspects of intense field harmonic- generation[J]. Journal of Physics B-Atomic Molecular and Optical Physics, 24, 3315-3341(1991).

[8] Seres J, Seres E, Verhoef A J et al. Laser technology: source of coherent kiloelectronvolt X-rays[J]. Nature, 433, 596-596(2005). http://europepmc.org/abstract/med/15703738

[9] Popmintchev T, Chen M C, Popmintchev D et al. Bright coherent ultrahigh harmonics in the keV X-ray regime from mid-infrared femtosecond lasers[J]. Science, 336, 1287-1291(2012). http://www.jstor.org/stable/41585009

[10] Paul P M, Toma E S, Breger P et al. Observation of a train of attosecond pulses from high harmonic generation[J]. Science, 292, 1689-1692(2001). http://www.ncbi.nlm.nih.gov/pubmed/11387467

[11] Cao W, Lu P, Lan P et al. Single-attosecond pulse generation with an intense multicycle driving pulse[J]. Physical Review A, 74, 063821(2006). http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=VIRT05000006000001000086000001&idtype=cvips&gifs=Yes

[12] Corkum P B. Plasma perspective on strong field multiphoton ionization[J]. Physical Review Letters, 71, 1994-1997(1993). http://ptep.oxfordjournals.org/external-ref?access_num=10.1103/PhysRevLett.71.1994&link_type=DOI

[13] Heyl C M, Güdde J, Höfer U et al. Spectrally resolved maker fringes in high-order harmonic generation[J]. Physical Review Letters, 107, 033903(2011). http://www.ncbi.nlm.nih.gov/pubmed/21838359

[14] Jin C, Stein G J, Hong K H et al. Generation of bright, spatially coherent soft X-ray high harmonics in a hollow waveguide using two-color synthesized laser pulses[J]. Physical Review Letters, 115, 043901(2015). http://www.ncbi.nlm.nih.gov/pubmed/26252685

[15] He L, Lan P, Zhang Q et al. Spectrally resolved spatiotemporal features of quantum paths in high-order-harmonic generation[J]. Physical Review A, 92, 043403(2015). http://www.oalib.com/paper/3553179

[16] Zhang J, Ge X L, Wang T et al. Spatial distribution on high-order-harmonic generation of an H2+ molecule in intense laser fields [J]. Physical Review A, 92, 013418(2015). http://journals.aps.org/pra/abstract/10.1103/PhysRevA.92.013418

[17] Xia C L, Zhang J, Miao X Y et al. Restraint of spatial distribution in high-order harmonic generation from a model of hydrogen molecular ion[J]. Chinese Physics B, 26, 073201(2017). http://www.cqvip.com/QK/85823A/201707/672612954.html

[18] Kienberger R, Hentschel M, Uiberacker M et al. Steering attosecond electron wave packets with light[J]. Science, 297, 1144-1148(2002). http://www.ncbi.nlm.nih.gov/pubmed/12114530

[19] Hentschel M, Kienberger R, Spielmann Ch et al. Attosecond metrology[J]. Nature, 414, 509-513(2001).

[20] Zhu X, Qin M, Li Y et al. Tomographic reconstruction of molecular orbitals with twofold mirror antisymmetry: overcoming the nodal plane problem[J]. Physical Review A, 87, 045402(2013). http://arxiv.org/abs/1304.5128

[21] Ge X L, Wang T, Guo J et al. Quantum-path control and isolated-attosecond-pulse generation using H2+ molecules with moving nuclei in few-cycle laser pulses [J]. Physical Review A, 89, 023424(2014). http://journals.aps.org/pra/abstract/10.1103/PhysRevA.89.023424

[22] Peng D, Pi L W, Frolov M V et al. Enhancing high-order-harmonic generation by time delays between two-color, few-cycle pulses[J]. Physical Review A, 95, 033413(2017). http://adsabs.harvard.edu/abs/2017PhRvA..95c3413P

[23] Feng X, Gilbertson S, Mashiko H et al. Generation of isolated attosecond pulses with 20 to 28 femtosecond lasers[J]. Physical Review Letters, 103, 183901(2009). http://www.ncbi.nlm.nih.gov/pubmed/19905806

[24] Yeung M, Dromey B, Cousens S et al. Dependence of laser-driven coherent synchrotron emission efficiency on pulse ellipticity and implications for polarization gating[J]. Physical Review Letters, 112, 123902(2014). http://europepmc.org/abstract/med/24724650

[25] Xia C L, Liu X S. Quantum path control and isolated attosecond pulse generation with the combination of two circularly polarized laser pulses[J]. Physical Review A, 87, 043406(2013). http://adsabs.harvard.edu/abs/2013PhRvA..87d3406X

[26] Salières P, Antoine P, Bohan A et al. Temporal and spectral tailoring of high-order harmonics[J]. Physical Review Letters, 81, 5544-5547(1998). http://prola.aps.org/abstract/PRL/v81/i25/p5544_1

[27] Xiang Y, Niu Y, Gong S. Control of the high-order harmonics cutoff through the combination of a chirped laser and static electric field[J]. Physical Review A, 79, 053419(2009). http://journals.aps.org/pra/abstract/10.1103/PhysRevA.79.053419

[28] Xu J, Zeng B, Yu Y. Extension of harmonic cutoff in a multicycle chirped pulse combined with a chirp-free pulse[J]. Physical Review A, 82, 053822(2010). http://adsabs.harvard.edu/abs/2010PhRvA..82e3822X

[29] Luo X Y, Ben S, Ge X L et al. High-order harmonics and attosecond pulse generation of a He+ ion by a chirped two-color inhomogeneous laser field[J]. Acta Physica Sinica, 64, 193201(2015).

[30] Zhang J, Pan X F, Du H et al. The spatial distribution in high-order harmonic generation of H2+ with different time delays of the two-color laser fields [J]. Optics Communications, 382, 495-500(2017). http://www.sciencedirect.com/science/article/pii/S003040181630726X