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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Holographic gratings are crucial optical elements.
    • Controlling beam splitting ratios optically offers advanced photonic applications.

    Purpose of the Study:

    • To demonstrate all-optically controlled beam splitting with a tunable split ratio.
    • To investigate the use of azobenzene liquid crystal films for creating such beam splitters.

    Main Methods:

    • Recording holographic gratings using two 532 nm beams with asymmetric polarization states in an azobenzene liquid crystal film.
    • Utilizing photoinduced birefringence for tunability.
    • Analyzing split ratios using Fresnel theory and Jones matrices.

    Main Results:

    • Achieved all-optically controlled beam splitting with tunable intensity ratios.
    • Demonstrated arbitrary split ratios from 0 to 1, independent of probe light polarization.
    • Identified dual-grating coupling as a key mechanism in beam splitter formation.

    Conclusions:

    • Azobenzene liquid crystal films can be used to create tunable, all-optically controlled holographic beam splitters.
    • Polarization modulation of recording light provides precise control over beam splitting ratios.
    • The developed method offers a new approach for advanced optical beam manipulation.