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

doi:10.1088/1674-1056/ab3bd4

中国物理B ›› 2019, Vol. 28 ›› Issue (10): 103202-103202.doi: 10.1088/1674-1056/ab3bd4

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

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

Jian-Wei Zhou(周建伟), Zhi-Hong Jiao(焦志宏), Peng-Cheng Li(李鹏程), Xiao-Xin Zhou(周效信)

Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China

收稿日期:2019-05-11 修回日期:2019-07-05 出版日期:2019-10-05 发布日期:2019-10-05
通讯作者: Zhi-Hong Jiao, Peng-Cheng Li, Xiao-Xin Zhou E-mail:jiaozh@nwnu.edu.cn;lipc@nwnu.edu.cn;zhouxx@nwnu.edu.cn
基金资助:
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.

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

Jian-Wei Zhou(周建伟), Zhi-Hong Jiao(焦志宏), Peng-Cheng Li(李鹏程), Xiao-Xin Zhou(周效信)

Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China

Received:2019-05-11 Revised:2019-07-05 Online:2019-10-05 Published:2019-10-05
Contact: Zhi-Hong Jiao, Peng-Cheng Li, Xiao-Xin Zhou E-mail:jiaozh@nwnu.edu.cn;lipc@nwnu.edu.cn;zhouxx@nwnu.edu.cn
Supported by:
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.

摘要/Abstract

摘要： 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.

关键词: harmonic generation below threshould ionization, dress state, Stark shift

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.

Key words: harmonic generation below threshould ionization, dress state, Stark shift

中图分类号: (Multiphoton ionization and excitation to highly excited states)

32.80.Rm

42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation) 42.65.Re (Ultrafast processes; optical pulse generation and pulse compression)

周建伟, 焦志宏, 李鹏程, 周效信. Role of the dressed and bound states on below-threshold harmonic generation of He atom[J]. 中国物理B, 2019, 28(10): 103202-103202.

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[J]. Chin. Phys. B, 2019, 28(10): 103202-103202.

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

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

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