Unraveling the dynamical origin of intense fifth harmonic generation from H2+ in a linearly laser field

doi:10.1088/1674-1056/ae23ab

中国物理B ›› 2025, Vol. 34 ›› Issue (12): 123301-123301.doi: 10.1088/1674-1056/ae23ab

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

收稿日期:2025-09-09 修回日期:2025-11-12 接受日期:2025-11-25 发布日期:2025-12-10
通讯作者: Ling-Ling Du, Xiao-Xin Zhou E-mail:lingling_du@nxu.edu.cn;zhouxx@nwnu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 12264039) and the Natural Science Foundation of Ningxia (Grant No. 2024AAC03013).

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

Received:2025-09-09 Revised:2025-11-12 Accepted:2025-11-25 Published:2025-12-10
Contact: Ling-Ling Du, Xiao-Xin Zhou E-mail:lingling_du@nxu.edu.cn;zhouxx@nwnu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 12264039) and the Natural Science Foundation of Ningxia (Grant No. 2024AAC03013).

摘要/Abstract

摘要： 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.

关键词: intense fifth-harmonic generation, hydrogen molecule ions, multiphoton resonance, multichannel interference

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.

Key words: intense fifth-harmonic generation, hydrogen molecule ions, multiphoton resonance, multichannel interference

中图分类号: (Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))

33.80.Rv

42.50.Hz (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift) 42.65.-k (Nonlinear optics)

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[J]. 中国物理B, 2025, 34(12): 123301-123301.

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Unraveling the dynamical origin of intense fifth harmonic generation from H₂⁺ in a linearly laser field

Unraveling the dynamical origin of intense fifth harmonic generation from H₂⁺ in a linearly laser field

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