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With the numerical solution of the time-dependent Schrodinger equation, we theoretically investigate the high-order harmonic emissions generated by the atoms irradiated by the ultrashort lasers with different wavelengths but the same pondermotive energy. As the driving-laser wavelength increases, the intensity of the high-harmonic emission decreases. Comparing with the harmonic spectra of atoms driven by a 1000-nm-wavelength laser pulse, a new peak structure appears in the spectra of atoms driven by a 5000-nm-wavelength laser wavelength. It is shown by the time-frequency analysis of the harmonic emission, the time-dependent evolution of the electron density, and the time-dependent population analysis of the eigenstate, that the physical mechanism behind the new peak appearing in the harmonic spectra is the interference between the harmonic emission generated by the electrons ionized out of the excited atoms returning to the parent ions and the harmonic emissions resulting from the ground state ionization.
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Keywords:
- higher harmonic generation /
- mid-infrared laser /
- attosecond pulse
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[1] Protopapas M, Keitel C H, Knight P L 1997 Rep. Prog. Phys. 60 389
Google Scholar
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Google Scholar
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[4] Porat G, Alon G, Rozen S, Pedatzur O, Krüger M, Azoury D, Natan A, Orenstein G, Bruner B D, Vrakking M J J, Dudovich N 2018 Nat. Commun. 9 2805
Google Scholar
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[8] Li X F, l’Huillier A, Ferray M, Lompré L A, Mainfray G 1989 Phys. Rev. A 39 5751
Google Scholar
[9] Altucci C, Velotta R, Heesel E, Springate E, Marangos J P, Vozzi C 2006 Phys. Rev. A 73 043411
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[10] Ishii N, Kaneshima K, Kitano K, Kanai T, Watanabe S, Itatani J 2014 Nat. Commun. 5 3331
Google Scholar
[11] Silva F, Teichmann S M, Cousin S L, Hemmer M, Biegert J 2015 Nat. Commun. 6 6611
Google Scholar
[12] Marangos J P 2016 J. Phys. B 49 132001
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
[38] Tian K, He L, Yang X, Liang H 2021 Photonics 8 290
Google Scholar
[39] Feng T, Heilmann A, Bock M, Ehrentraut L, Witting T, Yu H H, Stiel H, Eisebitt S, Schnürer M 2020 Opt. Express 28 8724
Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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[49] Guo F M, Yang Y J, Jin M X, Ding D J, Zhu Q R 2009 Chin. Phys. Lett. 26 053201
Google Scholar
[50] Serebryannikov E E, Zheltikov A M 2016 Phys. Rev. Lett. 116 123901
Google Scholar
[51] Chen J, Zeng B, Liu X, Cheng Y, Xu Z 2009 New J. Phys. 11 113021
Google Scholar
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