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    Area of Science:

    • Optics and Photonics
    • Light-Matter Interactions
    • Rotational Dynamics

    Background:

    • Orbital angular momentum (OAM) in light beams offers unique properties for light-matter interactions.
    • The rotational Doppler effect is a phenomenon where frequency shifts occur due to the rotation of a medium interacting with light.

    Purpose of the Study:

    • To investigate how a rotating medium affects beams carrying orbital angular momentum (OAM).
    • To analyze the influence of the rotational Doppler effect on light-matter interactions.

    Main Methods:

    • Utilizing a weak probe beam frequency-shifted relative to a strong pump beam.
    • Combining beams to study interactions within an externally rotating medium.

    Main Results:

    • Demonstrated modification of light-matter interaction by the rotational Doppler effect.
    • Observed absorption increasing with the medium's mechanical rotation velocity.
    • Found that the absorption rate is dependent on the OAM of the light beam.

    Conclusions:

    • The rotational Doppler effect significantly impacts OAM-carrying beams in rotating media.
    • OAM influences the rate of light absorption, which is modulated by mechanical rotation.