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A scheme to efficiently generate an intense short isolated attosecond pulse is presented by the combined laser pulse irradiating the coherent superposition state. The combined pulse is composed of a multi-cycle 800 nm laser and a 1600 nm one. Compared with the case of the fundamental laser irradiating the ground state, the cutoff position is significantly extended from 70th to 280th harmonic, a broadband supercontinuum spectrum with 108 eV spectral width can be produced which directly generates an isolated 38 attosecond pulse, the intensity of which is increased eleven orders of magnitude. Our simulation also shows that the value of the time delay has a large range to keep the isolated sub-50-as pulse generation. Moreover, the value of the time delay in the range between ±0.05π is optinal. This result shows that the scheme appears feasible for an experimental demonstration.
[1] Sansone G, Benedetti E, Calegari F, Vozzi C, Avaldi L, Flammini R, Poletto L, Villoresi P, Altucci C, Velotta R, Stagira S, Silvestri S De, Nisoli M 2006 Science 314 443
[2] Corkum P B, Krausz F 2007 Nature 3 381
[3] Krausz F, Ivanov M 2009 Rev. Mod. Phys. 81 163
[4] Corkum P B 1993 Phys. Rev. Lett. 71 1994
[5] Kienberger R, Goulielmakis E, Uiberacker M, Baltuska A, Yakovlev V, Bammer F, Scrinzi A, Westerwalbesloh Th, Kleineberg U, Heinzmann U, Drescher M, Krausz F 2004 Nature 427 817
[6] 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
[7] Zeng Z, Cheng Y, Song X, Li R, Xu Z 2007 Phys. Rev. Lett. 98 203901
[8] Zhang G T, Liu X S 2009 J. Phys. B 42 125603
[9] Zhao S F, Zhou X X, Li P C, Chen Z 2008 Phys. Rev. A 78 063404
[10] Hong W, Lu P, Lan P, Yang Z, Li Y, Liao Q 2008 Phys. Rev. A 77 033410
[11] Zhai Z, Yu R F, Liu X S, Yang Y J 2008 Phys. Rev. A 78 041402 (R)
[12] 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]
[13] Li H S, Li P C, Zhou X X 2009 Acta Phys. Sin. 58 7633 (in Chinese) [李会山、 李鹏程、 周效信 2009 物理学报 58 7633]
[14] Chen J G, Chen G, Chi F P, Yang Y J 2010 Acta Phys. Sin. 59 0236 (in Chinese) [陈基根、 陈 高、 池方萍、 杨玉军 2010 物理学报 59 0236]
[15] Chen J G, Chen G, Zeng S L, Yang Y J, Zhu Q R 2008 Acta Phys. Sin. 57 4104 (in Chinese) [陈基根、 陈 高、 曾思良、 杨玉军、 朱颀人 2008 物理学报 57 4104]
[16] 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 物理学报 58 1579]
[17] Cheng D, Yu B H, Tang Q B 2010 Acta Phys. Sin. 59 4564 (in Chinese) [陈 东、 余本海、 汤清彬 2010 物理学报 59 4564]
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[1] Sansone G, Benedetti E, Calegari F, Vozzi C, Avaldi L, Flammini R, Poletto L, Villoresi P, Altucci C, Velotta R, Stagira S, Silvestri S De, Nisoli M 2006 Science 314 443
[2] Corkum P B, Krausz F 2007 Nature 3 381
[3] Krausz F, Ivanov M 2009 Rev. Mod. Phys. 81 163
[4] Corkum P B 1993 Phys. Rev. Lett. 71 1994
[5] Kienberger R, Goulielmakis E, Uiberacker M, Baltuska A, Yakovlev V, Bammer F, Scrinzi A, Westerwalbesloh Th, Kleineberg U, Heinzmann U, Drescher M, Krausz F 2004 Nature 427 817
[6] 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
[7] Zeng Z, Cheng Y, Song X, Li R, Xu Z 2007 Phys. Rev. Lett. 98 203901
[8] Zhang G T, Liu X S 2009 J. Phys. B 42 125603
[9] Zhao S F, Zhou X X, Li P C, Chen Z 2008 Phys. Rev. A 78 063404
[10] Hong W, Lu P, Lan P, Yang Z, Li Y, Liao Q 2008 Phys. Rev. A 77 033410
[11] Zhai Z, Yu R F, Liu X S, Yang Y J 2008 Phys. Rev. A 78 041402 (R)
[12] 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]
[13] Li H S, Li P C, Zhou X X 2009 Acta Phys. Sin. 58 7633 (in Chinese) [李会山、 李鹏程、 周效信 2009 物理学报 58 7633]
[14] Chen J G, Chen G, Chi F P, Yang Y J 2010 Acta Phys. Sin. 59 0236 (in Chinese) [陈基根、 陈 高、 池方萍、 杨玉军 2010 物理学报 59 0236]
[15] Chen J G, Chen G, Zeng S L, Yang Y J, Zhu Q R 2008 Acta Phys. Sin. 57 4104 (in Chinese) [陈基根、 陈 高、 曾思良、 杨玉军、 朱颀人 2008 物理学报 57 4104]
[16] 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 物理学报 58 1579]
[17] Cheng D, Yu B H, Tang Q B 2010 Acta Phys. Sin. 59 4564 (in Chinese) [陈 东、 余本海、 汤清彬 2010 物理学报 59 4564]
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