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Updated: May 1, 2026

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Tunable orbital angular momentum mode filter based on optical geometric transformation.

Hao Huang, Yongxiong Ren, Guodong Xie

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    We developed a tunable optical filter to precisely control laser beams with orbital angular momentum (OAM). This technology allows selective filtering of specific OAM modes, crucial for advanced optical communications.

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    Area of Science:

    • Optics and Photonics
    • Quantum Information Science

    Background:

    • Spatially multiplexed laser beams carrying orbital angular momentum (OAM) are essential for high-capacity optical communications.
    • Efficient and selective filtering of individual OAM modes is a key challenge in OAM-based systems.

    Purpose of the Study:

    • To present a novel tunable mode filter for spatially multiplexed OAM laser beams.
    • To demonstrate the selective control and filtering of multiple OAM modes.

    Main Methods:

    • The filter utilizes an optical geometric transformation-based OAM mode sorter.
    • A programmable spatial light modulator (SLM) is integrated for selective OAM beam control.
    • Experimental demonstration with four multiplexed OAM modes (ℓ=-9, -4, +4, +9).

    Main Results:

    • Tunable filtering of one or multiple OAM modes was successfully demonstrated.
    • The output power suppression ratio between propagated and blocked modes exceeded 14.5 dB.
    • High precision in selecting and isolating specific OAM modes was achieved.

    Conclusions:

    • The developed tunable mode filter offers precise control over OAM states in multiplexed beams.
    • This technology has significant potential for applications in optical communications and quantum information processing.
    • The high suppression ratio validates the filter's effectiveness for OAM mode demultiplexing.