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By adjusting the polarized angle of a two-color laser field that is synthesized by a 12 fs/2000 nm and 12 fs/800 nm, we find that the spectrum of the high-order harmonic generation has a “funnel structure” in the second plateau when θ is π/2. And when θ is π/6, a bandwidth of supercontinuum about 290 eV is observed. We illustrate the structure of the high-order harmonic generated spectrum by the time-frequency analysis. An isolated attosecond pulse is obtained by intercepting an arbitrary 70 eV width in the supercontinuum plateau, and whose full width at half maximum (FWHM) is about 60 as. When we intercept a narrow width of the bandwidth of supercontinuum, a linear polarized attosecond pulse with FWHM 94 as is obtained. All those are convenient to generate and use attosecond pulse in experiment.
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Keywords:
- two-color polarized laser pulse /
- isolated attosecond pulse /
- high-order harmonic generation
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[8] 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]
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[10] Zhang Q B, Hong W Y, Lan P F, Yang Z Y, Lu P X 2008 Acta Phys. Sin. 57 7848(in Chinese) [张庆斌, 洪伟毅, 兰鹏飞, 杨振宇, 陆培祥 2008 物理学报 57 7848]
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[12] Zou P, Li R X, Zeng Z N, Xiong H, Liu P, Leng Y X, Fan P Z, Xu Z Z 2010 Chin. Phys. B 19 019501
[13] Hong WY, Lu P X, Lan P F, Li Q G, Zhang Q B, Yang Z Y,Wang X B 2008 Phys. Rev. A 78 063407
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[1] Föhlish A, Feulner P, Hennies F, Fink A, Menzel D, Sanchez- Portal D, Echenique P M, Wurth W 2005 Nature 436 373
[2] 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
[3] Sansone G, Benedetti 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
[4] Goulielmakis E, Schultze M, Hofsteter M, Yakovlev V S, Gagnon J, Uiberacker M, Aquila A L, Gullikson E M, Attwood D T, Kienberger R, Krausz F, U Kleineberg 2008 Science 320 1614
[5] Feng X, Gilbertson S, Mashiko H, Wang H, Khan S D, Chini M, Wu Y, Zhao K, Chang Z 2009 Phys. Rev. Lett. 103 183901
[6] Corkum P B 1993 Phys. Rev. Lett. 71 1994
[7] Zeng Z N, Cheng Y, Song X H, Li R X, Xu Z Z 2007Phys. Rev. Lett. 98 203901
[8] 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]
[9] Wu J, Zhang G T, Xia C L, Liu X S 2010 Phys. Rev. A 82 013411
[10] Zhang Q B, Hong W Y, Lan P F, Yang Z Y, Lu P X 2008 Acta Phys. Sin. 57 7848(in Chinese) [张庆斌, 洪伟毅, 兰鹏飞, 杨振宇, 陆培祥 2008 物理学报 57 7848]
[11] Xia C L, Zhang G T,Wu J, Liu X S 2010 Phys. Rev. A 81 043420
[12] Zou P, Li R X, Zeng Z N, Xiong H, Liu P, Leng Y X, Fan P Z, Xu Z Z 2010 Chin. Phys. B 19 019501
[13] Hong WY, Lu P X, Lan P F, Li Q G, Zhang Q B, Yang Z Y,Wang X B 2008 Phys. Rev. A 78 063407
[14] Cheng C Z, Zhou X X, Li P C 2011 Acta Phys. Sin. 60 033203 (in Chinese) [成春芝, 周效信, 李鹏程 2011 物理学报 60 033203]
[15] Feit M D, Fleck J A, JR, Steiger A 1982 J. Comput. Phys. 47 412
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