Energy-Resolved Ultrashort Delays of Photoelectron Emission Clocked by Orthogonal Two-Color Laser Fields

Xiaochun Gong, Cheng Lin, Feng He, Qiying Song, Kang Lin, Qinying Ji, Wenbin Zhang, Junyang Ma, Peifen Lu, Yunquan Liu, Heping Zeng, Weifeng Yang, and Jian Wu

Phys. Rev. Lett. 118, 143203 – Published 7 April 2017

Abstract

A phase-controlled orthogonal two-color (OTC) femtosecond laser pulse is employed to probe the time delay of photoelectron emission in the strong-field ionization of atoms. The OTC field spatiotemporally steers the emission dynamics of the photoelectrons and meanwhile allows us to unambiguously distinguish the main and sideband peaks of the above-threshold ionization spectrum. The relative phase shift between the main and sideband peaks, retrieved from the phase-of-phase of the photoelectron spectrum as a function of the laser phase, gradually decreases with increasing electron energy, and becomes zero for the fast electron which is mainly produced by the rescattering process. Furthermore, a Freeman resonance delay of $140 \pm 40$ attoseconds between photoelectrons emitted via the $4 f$ and $5 p$ Rydberg states of argon is observed.

Received 16 November 2016

DOI:https://doi.org/10.1103/PhysRevLett.118.143203

Physics Subject Headings (PhySH)

Atomic & molecular processes in external fields Multiphoton or tunneling ionization & excitation

Atomic, Molecular & Optical

Authors & Affiliations

Xiaochun Gong¹, Cheng Lin², Feng He³, Qiying Song¹, Kang Lin¹, Qinying Ji¹, Wenbin Zhang¹, Junyang Ma¹, Peifen Lu¹, Yunquan Liu⁴, Heping Zeng¹, Weifeng Yang^2,*, and Jian Wu^1,5,†

¹State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
²Department of Physics, College of Science, Shantou University, Shantou, Guangdong 515063, China
³Key Laboratory of Laser Plasmas (Ministry of Education) and Department of Physics and Astronomy, Collaborative Innovation Center for IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
⁴Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871, China
⁵Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China

^*wfyang@stu.edu.cn
^†jwu@phy.ecnu.edu.cn

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Issue

Vol. 118, Iss. 14 — 7 April 2017

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