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We propose an efficient method to generate an ultrashort attosecond pulse when a model He is exposed to the combination of an intense few-cycle chirped laser pulse and a half cycle pulse. By solving the time-dependent Schrdinger equation numerically, we find that the cut-off energy of the harmonics is extended effectively to Ip+21.6Up. By superimposing some high-order harmonics in different regions for the second plateau, the obtained pulses are all single attosecond ones. Minimum pulse achieves 37 as. Especially, by superimposing the lower order harmonics of the second plateau, one can obtain single attosecond pulse, and also the intensity of the single pulse is three order of magnitude higher than the attosecond pulse obtained near cut-off of harmonics.
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Keywords:
- intense few-cycle chirped laser /
- half cycle pulses /
- high-order harmonic generation /
- attosecond pulse
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[1] Krausz F, Ivanov M 2009 Rev. Mod. Phys. 81 163
[2] [3] Kaplan A E 1994 Phys. Rev. Lett. 73 1243
[4] Agostini P, DiMauro L F 2004 Rep. Prog. Phys. 67 813
[5] [6] Corkum P B 1993 Phys. Rev. Lett. 71 1994
[7] [8] [9] Hentschel M, Kienberger R, Spielmann C, Reider G A, Milosevic N, Brabec T, Corkum P, Heinzmann U, Drescher M, Krausz F 2001 Nature 414 509
[10] Sansone G, Beendetti E, Calegari F, Vozzi C, Avaldi L, Flammini R, Poletto L, Villoresi P, Altucci C, Velotta R, Stagira S, Silvestri S D, Nisoli M 2006 Science 314 443
[11] [12] Goulielmakis E, Schultze M, Hofstetter M, Yakovlev V S, Gagnon J, Uiberacker M, Aquila A L, Gullikson E M, Attwood D T, Kienberger R, Krausz F, Kleineberg U 2008 Science 320 1614
[13] [14] Zeng Z N, Cheng Y, Song X H, Li R X, Xu Z Z 2007 Phys. Rev. Lett. 98 203901
[15] [16] Zhang G T, Liu X S 2009 J. Phys. B 42 125603
[17] [18] Ye X L, Zhou X X, Zhao S F, Li P C 2009 Acta Phys. Sin. 58 1579 (in Chinese)[叶小亮、周效信、赵松峰、李鹏程 2009 58 1579]
[19] [20] [21] Hong W Y, Yang Z Y, Lan P F, Zhang Q B, Li Q G, Lu P X 2009 Acta Phys. Sin. 58 4914 (in Chinese)[洪伟毅、杨振宇、兰鹏飞、张庆斌、李钱光、陆培祥 2009 58 4914]
[22] [23] Chen J C, Zeng S L, Yang Y J 2010 Phys. Rev. A 82 043401
[24] Du H C, Wang H Q, Hu B T 2010 Phys. Rev. A 81 063813
[25] [26] Lu R F, He H X, Guo Y H, Han K L 2009 J. Phys. B 42 225601
[27] [28] [29] Chen J G, Yang Y J, Chen Y 2011 Acta Phys. Sin. 60 033202 (in Chinese)[陈基根、杨玉军、陈 漾 2011 60 033202]
[30] Du H C, Hu B T 2010 Opt. Express 18 25958
[31] [32] Zhao S F, Zhou X X, Li P C, Chen Z J 2008 Phys. Rev. A 78 063404
[33] [34] Li P C, Zhou X X, Wang G L, Zhao Z X 2009 Phys. Rev. A 80 053825
[35] [36] Xiang Y, Niu Y P, Gong S Q 2009 Phys. Rev. A 79 053419
[37] [38] [39] Xu J J, Zeng B, Xu Y L 2010 Phys. Rev. A 82 053822
[40] [41] Wu J, Zhang G T, Xia C L, Liu X S 2010 Phys. Rev. A 82 013411
[42] [43] Orlando G, Corso P P, Fiordilino E, Persico F 2009 J. Mod. Opt. 56 1761
[44] [45] Song X H, Yang W F, Zeng Z N, Li R X, Xu Z Z 2010 Phys. Rev. A 82 053821
[46] [47] Pan H L, Li P C, Zhou X X 2011 Acta Phys. Sin. 60 043203(in Chinese) [潘慧玲、李鹏程、周效信 2011 60 043203]
[48] Li P C, Zhou X X, Dong C Z, Zhao S F 2004 Acta Phys. Sin. 53 750 (in Chinese) [李鹏程、周效信、董晨钟、赵松峰 2004 53 750]
[49] [50] [51] Burnett K, Reed V C, Cooper J, Knight P L 1992 Phys. Rev. A 45 3347
[52] [53] Antoine P, Piraux B, Maquet A 1995 Phys. Rev. A 51 R1750
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