Abstract
The extreme ultraviolet (XUV) pulse effect on the ionization and recombination of the high-order harmonic generation has been theoretically studied. It is shown that (i) with the introduction of a shorter duration XUV pulse to a fundamental infrared (IR) pulse, the XUV photon can only be absorbed during the electron ionization process. Thus, the harmonic signal can be enhanced due to the XUV resonance transition and ionization. (ii) With the introduction of a longer-duration XUV pulse to a fundamental IR pulse, the XUV photon can be absorbed not only in the electron ionization process, but also in the electron recombination process. As a result, not only the harmonic signal can be improved, but also the harmonic cutoff can be extended with an additional XUV photon energy region (\(\omega _{\mathrm {XUV}})\). Moreover, as the XUV intensity increases, much more XUV photons can be absorbed in the electron recombination process, thus leading to the harmonic cutoff extension with the extra photon energy region of \(n\omega _{\mathrm {XUV}}\).
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Acknowledgements
This work was supported by the Natural Science Foundation of Liaoning province, China (Grants No. 2019-MS-167), and the Basic Research Project of Liaoning Provincial Education Department (Grants No. JJL201915405).
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Hang Liu and Yan Qiao calculated and analyzed the results of this paper. Liqiang Feng and Xiaodan Jing were the corresponding authors.
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Liu, H., Feng, L., Qiao, Y. et al. Extreme ultraviolet photon effect on ionization and recombination of high-order harmonic generation. Eur. Phys. J. D 75, 144 (2021). https://doi.org/10.1140/epjd/s10053-021-00153-0
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DOI: https://doi.org/10.1140/epjd/s10053-021-00153-0