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Orbital angular momentum bistability in a microlaser.

N Carlon Zambon, P St-Jean, A Lemaître

    Optics Letters
    |September 14, 2019
    PubMed
    Summary
    This summary is machine-generated.

    Researchers demonstrated optical switches using light's orbital angular momentum (OAM) in chiral microlasers. This bistability regime, involving distinct OAM and polarization states, arises from gain medium saturation.

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    Area of Science:

    • Optics and Photonics
    • Quantum Information Science

    Background:

    • Light's orbital angular momentum (OAM) offers unique properties for technological applications.
    • Helical beams possess an unbounded OAM degree of freedom.
    • Chiral microlasers are integrated devices capable of generating light with net OAM.

    Purpose of the Study:

    • To demonstrate a bistable regime in chiral microlasers involving distinct OAM states.
    • To explore the role of engineered spin-orbit coupling in light polarization.
    • To investigate the potential for ultrafast optical switches based on OAM.

    Main Methods:

    • Utilizing chiral microlasers to generate light emissions.
    • Investigating a bistability regime with OAM states ℓ=0 and ℓ=2.
    • Employing a dynamical model based on rate equations.
    • Analyzing polarization-dependent saturation of the gain medium.

    Main Results:

    • Demonstrated bistability between two modes with distinct OAM (ℓ=0 and ℓ=2).
    • Observed distinct circular and azimuthal polarizations for these modes due to engineered spin-orbit coupling.
    • Identified polarization-dependent gain medium saturation as the cause of bistability.

    Conclusions:

    • The demonstrated bistable regime is promising for developing ultrafast optical switches.
    • This work opens avenues for studying dynamical processes involving phase and polarization vortices.
    • Chiral microlasers provide a platform for manipulating OAM and polarization for advanced optical applications.