Universal Description of the Attoclock with Two-Color Corotating Circular Fields

We experimentally measure the laser-intensity-dependent photoelectron momentum distributions (PMDs) of Ar atoms with two-color (ω+2ω) corotating circularly polarized fields. The interference patterns on PMDs reveal complex structures with respect to the laser intensity ratio. The main above-threshol...

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Bibliographic Details
Published in:Physical review letters 2019-01, Vol.122 (1), p.013201-013201, Article 013201
Main Authors: Ge, Peipei, Han, Meng, Deng, Yongkai, Gong, Qihuang, Liu, Yunquan
Format: Article
Language:English
Subjects:
Circular polarization
Color
Field ionization
Interference
Lasers
Mathematical analysis
Pattern analysis
Photoelectrons
Sidebands
Wave packets
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Summary:We experimentally measure the laser-intensity-dependent photoelectron momentum distributions (PMDs) of Ar atoms with two-color (ω+2ω) corotating circularly polarized fields. The interference patterns on PMDs reveal complex structures with respect to the laser intensity ratio. The main above-threshold ionization peaks and sidebands on PMD distribute oppositely when the fundamental field is much weaker than the second-harmonic field, and the PMD reveals a characteristic single-lobe distribution when the two colors have comparable intensities. Using strong-field approximation, we analytically explain how the interference pattern on PMD evolves with respect to the relative laser intensity. By analyzing the interference pattern, we reveal the phase difference and the temporal evolution of the emitting electron wave packets. We show that, when monitoring the intensity ratio, the double-pointer attoclock geometry with corotating circular fields can be universally mimicked as the spatially rotating temporal double-slit experiments with the variable slit width, which can be used to probe and control strong-field ionization.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.122.013201