Multi-level effects in the high-order harmonic generation driven by intense frequency-comb laser fields

doi:10.1088/1674-1056/24/7/074205

中国物理B ›› 2015, Vol. 24 ›› Issue (7): 74205-074205.doi: 10.1088/1674-1056/24/7/074205

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Multi-level effects in the high-order harmonic generation driven by intense frequency-comb laser fields

赵迪, 蒋臣威, 李福利

Department of Applied Physics, School of Science, Xi'an Jiaotong University, Xi'an 710049, China

收稿日期:2015-01-03 修回日期:2015-01-21 出版日期:2015-07-05 发布日期:2015-07-05
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11374239, 21203144, and 11074199), the Doctoral Fund of Ministry of Education of China (Grant No. 20120201120056), and the Fundamental Research Funds for the Central Universities, China.

Multi-level effects in the high-order harmonic generation driven by intense frequency-comb laser fields

Zhao Di (赵迪), Jiang Chen-Wei (蒋臣威), Li Fu-Li (李福利)

Department of Applied Physics, School of Science, Xi'an Jiaotong University, Xi'an 710049, China

Received:2015-01-03 Revised:2015-01-21 Online:2015-07-05 Published:2015-07-05
Contact: Zhao Di E-mail:d.zhao@mail.xjtu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11374239, 21203144, and 11074199), the Doctoral Fund of Ministry of Education of China (Grant No. 20120201120056), and the Fundamental Research Funds for the Central Universities, China.

摘要/Abstract

摘要：

High harmonic generation (HHG) driven by intense frequency-comb laser fields can be dramatically enhanced via multiphoton resonance by tuning the carrier-envelope phase (CEP) shift, without increasing the driving intensity. However, the multiphoton-resonant enhancement (MRE) factor in the realistic atomic hydrogen is much smaller than that in a two-level system. To study the deviation, we present a theoretical investigation of the multiphoton resonance dynamics of three-level systems driven by intense frequency-comb laser fields. The many-mode Floquet theorem (MMFT) is employed to provide a nonperturbative and exact treatment of the interaction between the quantum system and the laser fields. The investigations show that the dipole interaction of a two-level system with the third level affects the multiphoton resonance dynamics and enhances the HHG spectra. It is the dipole interaction of the excited level of the two-level system with other levels that results in the smaller MRE factor in the realistic atomic system.

关键词: high-order harmonic generation, frequency-comb laser fields, multi-level effects

Abstract:

Key words: high-order harmonic generation, frequency-comb laser fields, multi-level effects

中图分类号: (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)

42.50.Hz

42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation)

赵迪, 蒋臣威, 李福利. Multi-level effects in the high-order harmonic generation driven by intense frequency-comb laser fields[J]. 中国物理B, 2015, 24(7): 74205-074205.

Zhao Di (赵迪), Jiang Chen-Wei (蒋臣威), Li Fu-Li (李福利). Multi-level effects in the high-order harmonic generation driven by intense frequency-comb laser fields[J]. Chin. Phys. B, 2015, 24(7): 74205-074205.

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Multi-level effects in the high-order harmonic generation driven by intense frequency-comb laser fields

Multi-level effects in the high-order harmonic generation driven by intense frequency-comb laser fields

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