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Universal Description of the Attoclock with Two-Color Corotating Circular Fields
Peipei Ge1, Meng Han1, Yongkai Deng1
1State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China.
Physical Review Letters
|April 24, 2019
Summary
Investigating argon atoms with two-color laser fields reveals complex photoelectron momentum patterns. The intensity ratio of laser fields controls interference, offering insights into electron wave packet dynamics and strong-field ionization control.
Area of Science:
- Atomic, Molecular, and Optical Physics
- Quantum Optics
- Strong-Field Physics
Background:
- Understanding strong-field ionization dynamics is crucial for attosecond science.
- Two-color laser fields offer enhanced control over electron emission compared to single-color fields.
- Photoelectron momentum distributions (PMDs) provide detailed information about electron trajectories.
Purpose of the Study:
- To experimentally measure laser-intensity-dependent PMDs of Argon atoms using two-color corotating circularly polarized fields.
- To analyze the complex interference structures in PMDs as a function of laser intensity ratio.
- To provide an analytical explanation for the observed interference patterns using strong-field approximation.
Main Methods:
- Experimental measurement of photoelectron momentum distributions (PMDs).
- Utilizing two-color (ω+2ω) corotating circularly polarized laser fields.
- Applying strong-field approximation for analytical modeling of interference patterns.
Main Results:
- Observed complex interference patterns in PMDs dependent on the laser intensity ratio.
- Demonstrated opposite distribution of ionization peaks and sidebands when the fundamental field is weaker.
- Revealed a single-lobe PMD distribution for comparable laser intensities.
- Identified phase differences and temporal evolution of electron wave packets through interference analysis.
Conclusions:
- The study provides a comprehensive understanding of laser-intensity-dependent PMDs in two-color fields.
- The double-pointer attoclock geometry with corotating circular fields mimics a variable slit width double-slit experiment.
- This technique offers a novel method for probing and controlling strong-field ionization dynamics.
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