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Tunable angular shearing interferometer based on wedged liquid crystal cells.

Romain Laberdesque, Aurélie Jullien, Umberto Bortolozzo

    Applied Optics
    |November 2, 2017
    PubMed
    Summary
    This summary is machine-generated.

    A novel liquid crystal wedge functions as a tunable shearing interferometer, offering high stability and precise fringe control via low voltage. This adaptable device shows promise for various optical applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Interferometry is crucial for precise measurements.
    • Liquid crystals offer tunable optical properties.

    Purpose of the Study:

    • To introduce and demonstrate a liquid crystal wedge as a tunable angular shearing interferometer.
    • To evaluate its stability, tunability, and uniformity.

    Main Methods:

    • Fabrication of liquid crystal wedges from planar aligned nematic liquid crystal cells with thickness gradients.
    • Analysis of interferograms generated by polarization interference.
    • Dynamic measurements to observe fringe behavior.

    Main Results:

    • The liquid crystal wedge demonstrated high stability and tunability.
    • Fringe periods were precisely controlled from 70 μm to 1.25 mm using low voltage.
    • Uniform interferograms were observed over large areas (5x5 mm).
    • Dynamic operation showed a stabilizing effect on fringes.

    Conclusions:

    • The liquid crystal wedge is a stable and tunable shearing interferometer.
    • It is suitable for large beam sizes and various applications like phase sensing and photolithography.