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Disentangling Intracycle Interferences in Photoelectron Momentum Distributions Using Orthogonal Two-Color Laser
Xinhua Xie1, Tian Wang2, ShaoGang Yu3
1Photonics Institute, Technische Universität Wien, 1040 Vienna, Austria.
Physical Review Letters
|December 30, 2017
Summary
Orthogonally polarized two-color laser pulses reveal new quantum interference in Argon atom ionization. This interference, dependent on laser phase, arises from unique quantum pathways.
Area of Science:
- Atomic Physics
- Quantum Mechanics
- Laser Physics
Background:
- Multiphoton ionization is a fundamental process in atomic physics.
- Understanding quantum pathways is crucial for controlling ionization dynamics.
Purpose of the Study:
- To investigate quantum path interference in Argon atom ionization using orthogonally polarized two-color laser pulses.
- To analyze the dependence of interference on the relative phase of the laser pulses.
Main Methods:
- Utilizing orthogonally polarized two-color (OTC) laser pulses (400 nm and 800 nm, 10:1 intensity ratio).
- Analyzing photoelectron momentum distributions.
- Performing theoretical model calculations.
Main Results:
- Observed a novel interference pattern in the photoelectron momentum distribution.
- Demonstrated strong dependence of the interference on the relative phase of the OTC pulse.
- Identified the interference origin from quantum pathways involving nonadjacent quarter cycles.
Conclusions:
- OTC laser pulses are effective in separating and observing quantum paths in multiphoton ionization.
- The observed interference provides new insights into electron dynamics and quantum interference phenomena.
- This study opens avenues for controlling atomic ionization processes through tailored laser fields.
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