Asymmetric structure of atomic above-threshold ionization spectrum in two-color elliptically polarized laser fields

doi:10.1088/1674-1056/ab3c2a

中国物理B ›› 2019, Vol. 28 ›› Issue (10): 103201-103201.doi: 10.1088/1674-1056/ab3c2a

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

Asymmetric structure of atomic above-threshold ionization spectrum in two-color elliptically polarized laser fields

Xu-Cong Zhou(周旭聪), Shang Shi(石尚), Fei Li(李飞), Yu-Jun Yang(杨玉军), Jing Chen(陈京), Qing-Tian Meng(孟庆田), Bing-Bing Wang(王兵兵)

1 School of Physics and Electronics, Shandong Normal University, Jinan 250358, China;
2 Laboratory of Optical Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 Insititute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
4 HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871, China;
5 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
6 University of Chinese Academy of Sciences, Beijing 100049, China

收稿日期:2019-05-16 修回日期:2019-07-08 出版日期:2019-10-05 发布日期:2019-10-05
通讯作者: Bing-Bing Wang E-mail:wbb@aphy.iphy.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11474348, 11674198, 11425414, and 11774411).

Asymmetric structure of atomic above-threshold ionization spectrum in two-color elliptically polarized laser fields

Xu-Cong Zhou(周旭聪)^1,2, Shang Shi(石尚)^2,6, Fei Li(李飞)^2,6, Yu-Jun Yang(杨玉军)³, Jing Chen(陈京)^4,5, Qing-Tian Meng(孟庆田)¹, Bing-Bing Wang(王兵兵)^2,6

1 School of Physics and Electronics, Shandong Normal University, Jinan 250358, China;
2 Laboratory of Optical Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 Insititute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
4 HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871, China;
5 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
6 University of Chinese Academy of Sciences, Beijing 100049, China

Received:2019-05-16 Revised:2019-07-08 Online:2019-10-05 Published:2019-10-05
Contact: Bing-Bing Wang E-mail:wbb@aphy.iphy.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11474348, 11674198, 11425414, and 11774411).

摘要/Abstract

摘要： According to the frequency-domain theory, we investigate the asymmetric structure of above-threshold ionization (ATI) spectrum of an atom in two-color elliptically polarized (EP) laser fields. When both laser fields are linearly polarized (LP), the spectrum shows that the multi-plateau structure is symmetric about the emitted angle of electron at π/2, while the spectrum becomes asymmetric and shifts rightwards with the increase of the EP degree of the IR laser field. Since the total ATI process is regarded as including direct ATI and the rescattering ATI, we analyze the spectrum structure of direct ATI and rescattering ATI separately. Using the saddle-point approximation, we find that for direct ATI, the fringes on the spectrum are mainly attributed to the fact that the ionization probability becomes very small when the direction of emitted electrons is perpendicular to the direction of the XUV laser polarization; while for the rescattering ATI, the interference fringes on the spectrum mainly come from the superposition of the waist structures on the spectra of all sub-channels.

关键词: above-threshold ionization, elliptically polarized, two color laser fields, asymmetric structure

Abstract: According to the frequency-domain theory, we investigate the asymmetric structure of above-threshold ionization (ATI) spectrum of an atom in two-color elliptically polarized (EP) laser fields. When both laser fields are linearly polarized (LP), the spectrum shows that the multi-plateau structure is symmetric about the emitted angle of electron at π/2, while the spectrum becomes asymmetric and shifts rightwards with the increase of the EP degree of the IR laser field. Since the total ATI process is regarded as including direct ATI and the rescattering ATI, we analyze the spectrum structure of direct ATI and rescattering ATI separately. Using the saddle-point approximation, we find that for direct ATI, the fringes on the spectrum are mainly attributed to the fact that the ionization probability becomes very small when the direction of emitted electrons is perpendicular to the direction of the XUV laser polarization; while for the rescattering ATI, the interference fringes on the spectrum mainly come from the superposition of the waist structures on the spectra of all sub-channels.

Key words: above-threshold ionization, elliptically polarized, two color laser fields, asymmetric structure

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

32.80.Rm

33.15.Dj (Interatomic distances and angles) 42.50.Hz (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift) 87.15.-v (Biomolecules: structure and physical properties)

周旭聪, 石尚, 李飞, 杨玉军, 陈京, 孟庆田, 王兵兵. Asymmetric structure of atomic above-threshold ionization spectrum in two-color elliptically polarized laser fields[J]. 中国物理B, 2019, 28(10): 103201-103201.

Xu-Cong Zhou(周旭聪), Shang Shi(石尚), Fei Li(李飞), Yu-Jun Yang(杨玉军), Jing Chen(陈京), Qing-Tian Meng(孟庆田), Bing-Bing Wang(王兵兵). Asymmetric structure of atomic above-threshold ionization spectrum in two-color elliptically polarized laser fields[J]. Chin. Phys. B, 2019, 28(10): 103201-103201.

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Asymmetric structure of atomic above-threshold ionization spectrum in two-color elliptically polarized laser fields

Asymmetric structure of atomic above-threshold ionization spectrum in two-color elliptically polarized laser fields

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