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Theoretical investigation of elliptical high-order harmonic generation from H2+ in two-color cross-linearly-polarized laser fields |
| Cai-Ping Zhang(张彩萍)1,2, Si-Hui Wang(王思慧)1,2, Yu-Zhi Chen(陈育之)1,2, Xin-Ru Du(杜欣茹)1,2, and Xiang-Yang Miao(苗向阳)1,2,† |
1 College of Physics and Information Engineering, Shanxi Normal University, Taiyuan 030031, China;
2 Key Laboratory of Spectral Measurement and Analysis of Shanxi Province, Shanxi Normal University, Taiyuan 030031, China |
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Abstract We theoretically investigate the elliptical high-order harmonic generation from H$_{2}^{+}$ in two-color cross-linearly-polarized laser fields by numerically solving the two-dimensional time-dependent Schrödinger equation. Numerical simulations show that the crossing-angle-dependent harmonic ellipticity exhibits a prominent antisymmetric structure, which tends to disappear as the internuclear distance increases. Furthermore, ground-state electrons experience resonant transitions to the first excited state at larger internuclear distances, where the disruption of symmetric electron motion suppresses the antisymmetric structure. Additionally, a near-circularly-polarized attosecond pulse can be obtained by modulating the crossing angle.
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Received: 14 February 2025
Revised: 31 March 2025
Accepted manuscript online: 24 April 2025
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PACS:
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33.80.Rv
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(Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))
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42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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42.65.Re
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(Ultrafast processes; optical pulse generation and pulse compression)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11974229, 12204291, and 11404204) and the Fund from Graduate Students of Shanxi Normal University, China (Grant No. 2023XSY044). |
Corresponding Authors:
Xiang-Yang Miao
E-mail: sxxymiao@126.com
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Cite this article:
Cai-Ping Zhang(张彩萍), Si-Hui Wang(王思慧), Yu-Zhi Chen(陈育之), Xin-Ru Du(杜欣茹), and Xiang-Yang Miao(苗向阳) Theoretical investigation of elliptical high-order harmonic generation from H2+ in two-color cross-linearly-polarized laser fields 2025 Chin. Phys. B 34 083301
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