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Nonsequential double ionization by co-rotating two-color circularly polarized laser fields.
Optics Express
|March 17, 2019
Summary
Co-rotating two-color laser fields can drive nonsequential double ionization (NSDI) in Argon via electron recollision. The yield is lower than counter-rotating fields but controllable by field ratio, offering insights into subcycle dynamics.
Area of Science:
- Atomic, Molecular, and Optical Physics
- Quantum Optics
- Laser-Matter Interactions
Background:
- Nonsequential double ionization (NSDI) is a key phenomenon in strong-field physics.
- Understanding electron recollision dynamics is crucial for controlling ionization processes.
- Two-color laser fields offer unique pathways to manipulate NSDI.
Purpose of the Study:
- To investigate NSDI of Argon (Ar) in co-rotating two-color circularly polarized (TCCP) laser fields.
- To analyze the influence of field ratio on NSDI yield and recollision dynamics.
- To explore the potential for accessing subcycle dynamics through electron momentum distributions.
Main Methods:
- Utilizing a three-dimensional classical ensemble model for simulations.
- Simulating NSDI of Ar atoms.
- Analyzing electron trajectories and momentum distributions.
Main Results:
- Co-rotating TCCP fields induce NSDI through electron recollision, albeit with yields an order of magnitude lower than counter-rotating fields.
- NSDI yield shows a strong dependence on the field ratio, maximizing at a ratio of 2.4.
- Short recollision trajectories (traveling time < 1 cycle) dominate in co-rotating TCCP fields.
- Recollision time is dependent on the field ratio and maps to the electron momentum distribution.
Conclusions:
- Co-rotating TCCP laser fields provide a controllable method for studying NSDI and electron recollision dynamics.
- The dependence of recollision time on field ratio offers a pathway to probe subcycle dynamics.
- This research enhances understanding of laser-driven electron dynamics in atomic systems.
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