| SPECIAL TOPIC — Ultrafast physics in atomic, molecular and optical systems |
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Unraveling the dynamical origin of intense fifth harmonic generation from H2+ in a linearly laser field |
| Ling-Ling Du(杜玲玲)1,†, Jiang-Yue Bu(卜江越)1, Cun-Bin Chen(陈存斌)1, and Xiao-Xin Zhou(周效信)2,3,‡ |
1 School of Physics, Ningxia University, Yinchuan 750021, China;
2 College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China;
3 Shenzhen Key Laboratory of Ultra-Intense Laser and Advanced Material Technology, College of Engineering Physics, Shenzhen Technology University, Shenzhen 518118, China |
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Abstract A systematic investigation of the fifth-harmonic generation in H2+, driven in the vicinity of a five-photon resonance by a linearly polarized laser field, has been carried out by numerically solving the full three-dimensional time-dependent Schrödinger equation. We observe a pronounced enhancement of the fifth harmonic, while the intensities of the adjacent harmonics are significantly suppressed. Our analysis shows that such an enhancement of the fifth harmonic is mainly caused by the multiphoton resonance transition, as well as multichannel interference. In addition, we investigate the depen-dence of harmonic emission on laser intensity and molecular orientation to identify the optimal conditions for enhancing the fifth-harmonic generation. Our results provide useful insights for producing coherent ultraviolet radiation at 106 nm experimentally.
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Received: 09 September 2025
Revised: 12 November 2025
Accepted manuscript online: 25 November 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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42.50.Hz
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(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
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42.65.-k
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(Nonlinear optics)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 12264039) and the Natural Science Foundation of Ningxia (Grant No. 2024AAC03013). |
Corresponding Authors:
Ling-Ling Du, Xiao-Xin Zhou
E-mail: lingling_du@nxu.edu.cn;zhouxx@nwnu.edu.cn
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Cite this article:
Ling-Ling Du(杜玲玲), Jiang-Yue Bu(卜江越), Cun-Bin Chen(陈存斌), and Xiao-Xin Zhou(周效信) Unraveling the dynamical origin of intense fifth harmonic generation from H2+ in a linearly laser field 2025 Chin. Phys. B 34 123301
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