
1.State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China
2.Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
3.Center for Applied Physics and Technology, HEDPS, Peking University, Beijing 100871, China
4.Beijing Academy of Quantum Information Sciences, Beijing 100193, China
Yunquan Liu (Yunquan.liu@pku.edu.cn)
Published:28 February 2022,
Published Online:08 February 2022,
Received:17 August 2021,
Revised:24 January 2022,
Accepted:26 January 2022
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Fang, Y.Q. et al. Probing the orbital angular momentum of intense vortex pulses with strong-field ionization. Light: Science & Applications, 11, 276-286 (2022).
Fang, Y.Q. et al. Probing the orbital angular momentum of intense vortex pulses with strong-field ionization. Light: Science & Applications, 11, 276-286 (2022). DOI: 10.1038/s41377-022-00726-7.
With the rapid development of femtosecond lasers
the generation and application of optical vortices have been extended to the regime of intense-light-matter interaction. The characterization of the orbital angular momentum (OAM) of intense vortex pulses is very critical. Here
we propose and demonstrate a novel photoelectron-based scheme that can in situ distinguish the OAM of the focused intense femtosecond optical vortices without the modification of light helical phase. We employ two-color co-rotating intense circular fields in the strong-field photoionization experiment
in which one color light field is a plane wave serving as the probing pulses and the other one is the vortex pulses whose OAM needs to be characterized. We show that by controlling the spatial profile of the probing pulses
the OAM of the vortex pulses can be clearly identified by measuring the corresponding photoelectron momentum distributions or angle-resolved yields. This work provides a novel in situ detection scenario for the light pulse vorticity and has implications for the studies of ultrafast and intense complex light fields with optical OAM.
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