中国物理B ›› 2020, Vol. 29 ›› Issue (2): 23201-023201.doi: 10.1088/1674-1056/ab5fbf

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇    下一篇

Phase jump in resonance harmonic emission driven by strong laser fields

Yuan-Yuan Zhao(赵媛媛), Di Zhao(赵迪), Chen-Wei Jiang(蒋臣威), Ai-Ping Fang(方爱平), Shao-Yan Gao(高韶燕), Fu-Li Li(李福利)   

  1. School of Science, Xi'an Jiaotong University, Xi'an 710049, China
  • 收稿日期:2019-11-06 修回日期:2019-11-26 出版日期:2020-02-05 发布日期:2020-02-05
  • 通讯作者: Di Zhao E-mail:d.zhao@mail.xjtu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11504288, 11534008, and 91536115) and the Fundamental Research Funds for the Central Universities of China.

Phase jump in resonance harmonic emission driven by strong laser fields

Yuan-Yuan Zhao(赵媛媛), Di Zhao(赵迪), Chen-Wei Jiang(蒋臣威), Ai-Ping Fang(方爱平), Shao-Yan Gao(高韶燕), Fu-Li Li(李福利)   

  1. School of Science, Xi'an Jiaotong University, Xi'an 710049, China
  • Received:2019-11-06 Revised:2019-11-26 Online:2020-02-05 Published:2020-02-05
  • Contact: Di Zhao E-mail:d.zhao@mail.xjtu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11504288, 11534008, and 91536115) and the Fundamental Research Funds for the Central Universities of China.

摘要: We present a theoretical investigation of the multiphoton resonance dynamics in the high-order-harmonic generation (HHG) process driven by a strong driving continuous wave (CW) field along with a weak control harmonic field. The Floquet theorem is employed to provide a nonperturbative and exact treatment of the interaction between a quantum system and the combined laser field. Multiple multiphoton-transition paths for the harmonic emission are coherently summed. The phase information about paths can be extracted via the Fourier transform analysis of the harmonic signals which oscillate as a function of the relative phase between driving and control fields. Phase jumps are observed when sweeping across the resonance by varying the frequency or intensity of the driving field. The phase variation as a function of driving frequency at a fixed intensity and as a function of the intensity at a fixed driving frequency allows us to determine the intensity dependence of the transition energy of quantum systems.

关键词: phase jump, high-order harmonic generation, Stark-shifted transition energy

Abstract: We present a theoretical investigation of the multiphoton resonance dynamics in the high-order-harmonic generation (HHG) process driven by a strong driving continuous wave (CW) field along with a weak control harmonic field. The Floquet theorem is employed to provide a nonperturbative and exact treatment of the interaction between a quantum system and the combined laser field. Multiple multiphoton-transition paths for the harmonic emission are coherently summed. The phase information about paths can be extracted via the Fourier transform analysis of the harmonic signals which oscillate as a function of the relative phase between driving and control fields. Phase jumps are observed when sweeping across the resonance by varying the frequency or intensity of the driving field. The phase variation as a function of driving frequency at a fixed intensity and as a function of the intensity at a fixed driving frequency allows us to determine the intensity dependence of the transition energy of quantum systems.

Key words: phase jump, high-order harmonic generation, Stark-shifted transition energy

中图分类号:  (Coherent control of atomic interactions with photons)

  • 32.80.Qk
42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation) 42.50.Hz (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)