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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Topological light fields for highly non-linear charge quantum dynamics and high harmonic generation.

Jonas Wätzel, Jamal Berakdar

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    |July 17, 2020
    PubMed
    Summary

    We theoretically investigated electron quantum dynamics in atoms using structured intense infrared laser pulses. High harmonic emissions were analyzed, revealing a topological index transfer from the laser pulse to the harmonics.

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    Area of Science:

    • Quantum Dynamics
    • Atomic Physics
    • Nonlinear Optics

    Background:

    • Intense infrared (IR) laser pulses drive complex electron quantum dynamics in atoms.
    • This nonlinear behavior leads to the emission of high harmonics.
    • Structured laser beams, such as radially and azimuthally polarized light, offer unique control over these dynamics.

    Purpose of the Study:

    • To theoretically investigate electron quantum dynamics driven by structured IR laser pulses.
    • To calculate, analyze, and characterize the resulting high harmonic emission.
    • To explore the influence of laser pulse topology on harmonic properties.

    Main Methods:

    • Theoretical study of electron quantum dynamics.
    • Calculation and analysis of high harmonic generation (HHG).
    • Investigation of radially polarized, azimuthally polarized, and optical skyrmion laser pulses.

    Main Results:

    • Identified a topological index inherent to the driving pulse topology.
    • Demonstrated that high harmonics inherit this topological index.
    • Observed that all emitted harmonics share the same topological index.
    • Found that vector IR pulses lead to a tightened far-field beam with higher topological order.

    Conclusions:

    • The topology of structured IR laser pulses dictates the topological properties of emitted high harmonics.
    • Optical skyrmions maintain the topological order of the emitted beam.
    • This work provides insights into controlling HHG with structured light.