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Updated: Jul 31, 2025

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Identification of orbital angular momentum using atom-based spatial self-phase modulation.

Wei Gao, Sandan Wang, Jinpeng Yuan

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    |May 9, 2023
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    Summary

    We identified orbital angular momentum modes using spatial self-phase modulation in rubidium vapor. This method rapidly reads vortex beam properties, crucial for quantum information and optical measurements.

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    Area of Science:

    • Quantum Optics
    • Atomic Physics
    • Nonlinear Optics

    Background:

    • Orbital angular momentum (OAM) modes are vital for quantum information coding, super-resolution imaging, and optical measurements.
    • Accurate identification of OAM modes is essential for advancing these fields.

    Purpose of the Study:

    • To present a novel method for identifying orbital angular momentum modes.
    • To utilize spatial self-phase modulation in atomic vapor for OAM mode readout.

    Main Methods:

    • Focused vortex laser beams spatially modulated the refractive index of rubidium atomic vapor.
    • Nonlinear phase shifts were analyzed to determine OAM modes.
    • Diffraction patterns with distinguishable tails were observed.

    Main Results:

    • The number and rotation direction of diffraction pattern tails directly corresponded to the magnitude and sign of the input beam's OAM.
    • The visualization of OAM identification was adjustable via incident power and frequency detuning.

    Conclusions:

    • Spatial self-phase modulation in atomic vapor offers a feasible and effective method for rapid OAM mode readout.
    • This technique enhances the capability for analyzing vortex beams in optical applications.