Phase jump in resonance harmonic emission driven by strong laser fields

doi:10.1088/1674-1056/ab5fbf

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.

Keywords: phase jump high-order harmonic generation Stark-shifted transition energy

Received: 06 November 2019
Revised: 26 November 2019
Accepted manuscript online:

PACS:	32.80.Qk	(Coherent control of atomic interactions with photons)
	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)

Fund: 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.

Corresponding Authors: Di Zhao
E-mail: d.zhao@mail.xjtu.edu.cn

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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) Phase jump in resonance harmonic emission driven by strong laser fields 2020 Chin. Phys. B 29 023201

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Phase jump in resonance harmonic emission driven by strong laser fields

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