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Angular momentum characterizes an object's rotational motion and is defined as the moment of its linear momentum about a specified point O. When a particle moves along a curved path in the x-y plane, the scalar formulation calculates the magnitude of its angular momentum, utilizing the moment arm (d), representing the perpendicular distance from point O to the line of action of the linear momentum. Despite being scalar in formulation, angular momentum is inherently a vector quantity. Its...
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Related Experiment Video

Updated: Feb 11, 2026

A Rapid and Chemical-free Hemoglobin Assay with Photothermal Angular Light Scattering
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Orbital angular momentum transition of light using a cylindrical vector beam.

Ya Han, Lei Chen, Yan-Ge Liu

    Optics Letters
    |May 2, 2018
    PubMed
    Summary

    Researchers switched light

    Area of Science:

    • Optics and Photonics
    • Fiber Optics
    • Light Polarization

    Background:

    • Controlling the orbital angular momentum (OAM) of light is crucial for applications in optical communications and microscopy.
    • Conventional methods often involve complex setups with superposed eigenmodes, limiting stability and flexibility.

    Purpose of the Study:

    • To demonstrate a stable and tunable method for switching the OAM of light using a single cylindrical vector (CV) beam in two-mode fibers.
    • To introduce a novel approach for generating tunable generalized CV beams using rocking-long period fiber gratings.

    Main Methods:

    • Utilizing a single cylindrical vector (CV) beam as the input light source.
    • Employing a rocking-long period fiber grating to generate tunable generalized CV beams.
    • Propagating the CV beam through two-mode fibers to switch OAM states.

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    Main Results:

    • Successfully switched the orbital angular momentum of light among -1, 0, and 1 using a single CV beam.
    • Verified the generation of tunable generalized CV beams with a rocking-long period fiber grating.
    • Achieved enhanced stability compared to conventional superposed eigenmodes methods.

    Conclusions:

    • The proposed method offers a more stable and simpler approach for OAM manipulation.
    • This technique bridges the gap between polarization singularity and phase singularity beams.
    • The use of a single CV beam simplifies the generation and control of OAM states in optical fibers.