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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Polarization-insensitive wide-angle resonant acousto-optic phase modulator.

Okan Atalar, Amin Arbabian

    Optics Letters
    |April 15, 2024
    PubMed
    Summary

    This study introduces a new acousto-optic phase modulator, offering broad light acceptance angles and insensitivity to polarization. This innovation advances optical device technology for broader applications.

    Area of Science:

    • Optics and Photonics
    • Acousto-Optics

    Background:

    • Free-space phase modulators commonly use Pockels effect crystals.
    • Pockels effect modulators require precise alignment of light polarization and incidence angle.
    • This alignment requirement limits their practical application and ease of use.

    Purpose of the Study:

    • To demonstrate a novel free-space resonant phase modulator.
    • To achieve broad acceptance angles for light.
    • To minimize dependence on the input light's polarization state.

    Main Methods:

    • Employed an acousto-optic approach for phase modulation.
    • Designed resonant structures for enhanced performance.
    • Investigated modulator performance with varying light conditions.

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    Main Results:

    • Successfully constructed free-space resonant phase modulators.
    • Demonstrated broad acceptance angles for incident light.
    • Showcased minimal dependence on light polarization.
    • Achieved megahertz frequency operation with modest power.
    • Modulators feature large apertures (>1 cm²) and sub-millimeter thickness.

    Conclusions:

    • Acousto-optic phase modulators offer a viable alternative to Pockels effect devices.
    • The developed modulators provide enhanced usability due to relaxed alignment constraints.
    • These modulators are suitable for applications requiring robust and versatile phase control in free-space optics.