We perform an experimental study on high-order harmonic generation (HHG) of aligned acetylene molecules induced by a 35-fs 800-nm strong laser field, by using a home-built HHG spectrometer. It is observed that the molecular HHG probability declines with increasing the laser ellipticity, which is in consistence with the deduction from the well-known tunneling-plus-rescattering scenario. By introducing a weak femtosecond laser pulse to non-adiabatically align the molecules, we investigated the molecular orbital effect on the HHG in both linearly and elliptically polarized driving laser fields. The results show that the harmonic intensity is maximum for the molecular axis aligned perpendicularly to the laser electric field. It indicates that both the highest occupied molecular orbitals (HOMO) and HOMO-1 contribute to the strong-field HHG of acetylene molecules. Our study should pave the way for understanding the interaction of molecules with ultrafast strong laser fields.
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August 2018
Research Article|
August 01 2018
High-Order harmonic generation of aligned acetylene in elliptically polarized strong laser fields†
Hong-jing Liang;
Hong-jing Liang
Institute of Atomic and Molecular Physics, Jilin University
, Changchun 130012, China
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Qiao-xia Wang;
Qiao-xia Wang
Institute of Atomic and Molecular Physics, Jilin University
, Changchun 130012, China
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Xin Fan;
Xin Fan
Institute of Atomic and Molecular Physics, Jilin University
, Changchun 130012, China
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Li-yu Shan;
Li-yu Shan
Institute of Atomic and Molecular Physics, Jilin University
, Changchun 130012, China
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Shuang Feng;
Shuang Feng
Institute of Atomic and Molecular Physics, Jilin University
, Changchun 130012, China
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Bing Yan;
Bing Yan
Institute of Atomic and Molecular Physics, Jilin University
, Changchun 130012, China
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Ri Ma;
Ri Ma
*
Institute of Atomic and Molecular Physics, Jilin University
, Changchun 130012, China
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Hai-feng Xu
Hai-feng Xu
*
Institute of Atomic and Molecular Physics, Jilin University
, Changchun 130012, China
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†
Part of the special issue for celebration of “the 60th Anniversary of University of Science and Technology of China and the 30th Anniversary of Chinese Journal of Chemical Physics”.
Chin. J. Chem. Phys. 31, 471–476 (2018)
Article history
Received:
May 25 2018
Accepted:
July 20 2018
Citation
Hong-jing Liang, Qiao-xia Wang, Xin Fan, Li-yu Shan, Shuang Feng, Bing Yan, Ri Ma, Hai-feng Xu; High-Order harmonic generation of aligned acetylene in elliptically polarized strong laser fields. Chin. J. Chem. Phys. 1 August 2018; 31 (4): 471–476. https://doi.org/10.1063/1674-0068/31/cjcp1805117
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