Role of the dressed and bound states on below-threshold harmonic generation of He atom

doi:10.1088/1674-1056/ab3bd4

Abstract High-order harmonic generation below ionization threshold of He atom in the laser field is investigated by solving the three-dimensional time-dependent Schrödinger equation. An angular momentum-dependent model potential of He atom was used for getting the accurate energy levels of singlet states. The satellite-peak structures of the below-threshold harmonic generation (BTHG) of He are observed. We analyze the emission properties of the BTHG by employing a synchrosqueezing transform technique. We find that the satellite-peak structures have two types related to two kinds of transitions. One is the transition of the dressed states of the excited states, the other is the transition between the excited states and the ground state in the field-free case. Furthermore, our results show that the maximum Stark shift of the 2p state is about 0.9U_p (penderomotive energy), and that of the 4p state is about 1.0U_p. It indicates that the energy difference between some satellite- and main-peaks of the BTHG can be used to measure the maximum Stark shift of the excited states of He atom in the laser field.

Keywords: harmonic generation below threshould ionization dress state Stark shift

Received: 11 May 2019
Revised: 05 July 2019
Accepted manuscript online:

PACS:	32.80.Rm	(Multiphoton ionization and excitation to highly excited states)
	42.65.Ky	(Frequency conversion; harmonic generation, including higher-order harmonic generation)
	42.65.Re	(Ultrafast processes; optical pulse generation and pulse compression)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11674268, 11764038, and 11765018) and the Scientific Research Foundation of Physics of CPEE-NWNU and NWNU-LKQN-17-1, China.

Corresponding Authors: Zhi-Hong Jiao, Peng-Cheng Li, Xiao-Xin Zhou
E-mail: jiaozh@nwnu.edu.cn;lipc@nwnu.edu.cn;zhouxx@nwnu.edu.cn

Cite this article:

Jian-Wei Zhou(周建伟), Zhi-Hong Jiao(焦志宏), Peng-Cheng Li(李鹏程), Xiao-Xin Zhou(周效信) Role of the dressed and bound states on below-threshold harmonic generation of He atom 2019 Chin. Phys. B 28 103202

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Role of the dressed and bound states on below-threshold harmonic generation of He atom

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