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We have investigated theoretically the high-order harmonics and attosecond pulse generation by numerically solving the one-dimensional time-dependent Schrödinger equation from a helium atom in a two-color laser field, which is synthesized by adding a 1330-nm infrared pulse with higher intensity to an 800-nm fundamental pulse with lower intensity. Our results clearly show that if the phase difference between the two pulses is selected suitably, the generation of high-order harmonics spectrum with a broadband supercontinuum characteristic can be achieved, and an isolated 38 as pulse can be realized. By the time-frequency analysis, we find that the isolated attosecond pulse comes from the contribution of the long and short quantum paths, and for these two quantum paths the change of emission time with the harmonics order is rather slow. This is different from the traditional isolated attosecond pulse generation that a single quantum path needs to be picked up to obtain an isolated attosecond pulse.
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Keywords:
- high harmonics generation /
- single attosecond pulse /
- quantum path
[1] Hentschel M, Kienberger R, Spielmann Ch, Reider G A, Milosevic N, Brabec T, Corkum P, Heinzmann U, Drescher M, Krausz F 2001 Nature 414 509
[2] Drescher M, Hentschel M, Drescher M, Kienberger R, Tempea G, Spielmann C, Reider G A, CorkumP B, Krausz F 2001 Science 291 1923
[3] Drescher M, Hentschel M, Kienberger R, Uiberacker M, Yakovlev V, Scrinzi A, Westerwalbesloh T H, Kleineberg U, Heinzmann U, Krausz F 2002 Nature 419 803
[4] Corkum P B 1993 Phys. Rev. Lett. 71 1994
[5] Bartels R A, Paul A, Green H, Kapteyn H C, Mumane M M, Backus S, Christov I P, Liu Y, Attwood D, Jacobsen C 2002 Science 297 376
[6] Paul P M, Toma E S, Breger P, Mullot G, Auge F, Balcou Ph, Muller H G, Agostini P 2001 Science 292 1689
[7] 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
[8] Hong W Y, Zhang Q B, Yang Z Y, Lu P X 2009 Phys. Rev. A 80, 053407
[9] Liu I L, Li P C, Chu Shih-I 2011 Phys. Rev. A 84 033414
[10] Chen J G, Zeng S L, Yang Y J 2010 Phys. Rev. A 82 043401
[11] Chen J G, Yang Y J, Yu X P, He L J, Xu Y Y 2011 Acta Phys. Sin. 60 053206 (in Chinese) [陈基根, 杨玉军, 俞旭萍, 何龙君, 徐圆圆 2011 物理学报 60 053206]
[12] 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 物理学报 60 033202]
[13] Liu S, Chen G, Chen J G, Zhu Q R 2009 Acta Phys. Sin. 58 1574 (in Chinese) [刘硕, 陈高, 陈基根, 朱颀人 2009 物理学报 58 1574]
[14] Eberly J H, Su Q, Javanainen J 1989 Phys. Rev. Lett. 62 881
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[1] Hentschel M, Kienberger R, Spielmann Ch, Reider G A, Milosevic N, Brabec T, Corkum P, Heinzmann U, Drescher M, Krausz F 2001 Nature 414 509
[2] Drescher M, Hentschel M, Drescher M, Kienberger R, Tempea G, Spielmann C, Reider G A, CorkumP B, Krausz F 2001 Science 291 1923
[3] Drescher M, Hentschel M, Kienberger R, Uiberacker M, Yakovlev V, Scrinzi A, Westerwalbesloh T H, Kleineberg U, Heinzmann U, Krausz F 2002 Nature 419 803
[4] Corkum P B 1993 Phys. Rev. Lett. 71 1994
[5] Bartels R A, Paul A, Green H, Kapteyn H C, Mumane M M, Backus S, Christov I P, Liu Y, Attwood D, Jacobsen C 2002 Science 297 376
[6] Paul P M, Toma E S, Breger P, Mullot G, Auge F, Balcou Ph, Muller H G, Agostini P 2001 Science 292 1689
[7] 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
[8] Hong W Y, Zhang Q B, Yang Z Y, Lu P X 2009 Phys. Rev. A 80, 053407
[9] Liu I L, Li P C, Chu Shih-I 2011 Phys. Rev. A 84 033414
[10] Chen J G, Zeng S L, Yang Y J 2010 Phys. Rev. A 82 043401
[11] Chen J G, Yang Y J, Yu X P, He L J, Xu Y Y 2011 Acta Phys. Sin. 60 053206 (in Chinese) [陈基根, 杨玉军, 俞旭萍, 何龙君, 徐圆圆 2011 物理学报 60 053206]
[12] 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 物理学报 60 033202]
[13] Liu S, Chen G, Chen J G, Zhu Q R 2009 Acta Phys. Sin. 58 1574 (in Chinese) [刘硕, 陈高, 陈基根, 朱颀人 2009 物理学报 58 1574]
[14] Eberly J H, Su Q, Javanainen J 1989 Phys. Rev. Lett. 62 881
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