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The time-dependent Schrodinger equation of alkali metal Na atom in an infrared laser field is solved numerically by using the pseudo-spectral method. In the calculation, an accurate model potential of Na atom is used. The bound state energy levels, which are consistent with experimental data, are obtained with the potential, so that we can study the characteristics of high-order harmonic generation for emission of the exited stated of Na atom. Our results show that the high-order generation spectrum of emission of 4s, and 5s excited states of Na atom is super-continuum in the over-barrier ionization regime. By superposed certain orders harmonics below threshold, a single pulse can be obtained with the central frequency from high frequency of visible light to the ultraviolet band. Through the calculated ionization probability of Na atom and the time-frequency analysis by wavelet transform of the superposed harmonics, it reveals that the emission process of low-order harmonic generation in over-barrier ionization regime is different from in the tunnel ionization regime.
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[1] Niikura H, et al. 2002Nature 417 917
[2] Niikura H, et al. 2003Nature 421 826
[3] Kienberger R, et al. 2004Nature 427 817
[4] Itatani J, et al. 2004Nature 432 867
[5] Vampa G, et al. 2015Phys. Rev. Lett. 115 193603
[6] Goulielmakis E, et al. 2008Science 320 1614
[7] Luo X Y, Ben S, Ge X L, Wang Q, Guo J, Liu X S 2015Acta Phys. Sin. 64 193201(in Chinese)[罗香怡, 贲帅, 葛鑫磊, 王群, 郭静, 刘学深2015物理学报64 193201]
[8] Chen G, Yang Y J, Guo F M 2013Acta Phys. Sin. 62 73203(in Chinese)[陈高, 杨玉军, 郭福明2013物理学报62 73203]
[9] Wang G L, Jin C, Le A T, Lin C D 2012Phys. Rev. A 86 015401
[10] Krausz F, Ivanov M 2009Rev. Mod. Phys. 81 163
[11] Corkum P B 1993Phys. Rev. Lett. 71 1994
[12] Zhao K, Zhang Q, Chini M, et al. 2012Opt. Lett. 37 3891
[13] Zeng Z N, Cheng Y, Song X H, Li R X, Xu Z Z 2007Phys. Rev. Lett. 98 203901
[14] Zhang G T, Liu X S 2009J. Phys. B 42 125603
[15] Hong W Y, Yang Z Y, Lan P F, Zhang Q B, Li Q G, Lu P X 2009Acta Phys. Sin. 58 4919(in Chinese)[洪伟毅, 杨振宇, 兰鹏飞, 张庆斌, 李钱光, 陆培祥2009物理学报58 4919]
[16] Chen J G, Zeng S L, Yang Y J 2010Phys. Rev. A 82 043401
[17] Du H C, Wang H Q, Hu B T 2010Phys. Rev. A 81 063813
[18] Lu R F, He H X, Guo Y H, Han K L 2009J. Phys. B 42 225601
[19] Li P C, Zhou X X, Zhao S F, Wang G L, Zhao Z X 2009Phys. Rev. A 80 053825
[20] Xiang Y, Niu Y P, Gong S Q 2009Phys. Rev. A 79 053419
[21] Jiao Z H, Wang G L, Li P C, Zhou X X 2014Phys. Rev A 90 025401
[22] Chu X, Chu S I, Laughlin C 2001Phys. Rev. A 64 013406
[23] Tong X M, Chu S I 1997Chem. Phys. 217 119
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