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    This study characterizes ferroelectric-liquid-crystal-on-silicon (FLCOS) spatial light modulators for hologram production in interferometric metrology. FLCOS devices achieve precise wavefront correction, minimizing errors for accurate measurements.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Holography

    Background:

    • Ferroelectric-liquid-crystal-on-silicon (FLCOS) spatial light modulators (SLMs) offer potential for advanced holographic applications.
    • Previous work indicated FLCOS SLMs can generate reference surfaces with residual errors from higher-order structures.

    Purpose of the Study:

    • To quantify residual wavefront errors in FLCOS-generated holograms for interferometric metrology.
    • To assess the performance of FLCOS SLMs in correcting aberrations and reducing fringe density.

    Main Methods:

    • Characterization of FLCOS SLM performance in hologram production.
    • Quantification of residual wavefront errors for increasing Zernike astigmatism aberrations.
    • Measurement of a vacuum window element using FLCOS to reduce interferometric fringe density.

    Main Results:

    • Achieved a Zernike-corrected root-mean-square (rms) wavefront error of approximately 0.06 waves for up to nine waves rms Zernike astigmatism.
    • Demonstrated high vibrational stability of the FLCOS device.
    • Measured a residual wavefront error of 0.046 waves rms for a vacuum window element, with errors primarily from the test piece.

    Conclusions:

    • FLCOS SLMs are effective for producing holograms with high accuracy in interferometric metrology.
    • The device significantly reduces wavefront errors and interferometric fringe density.
    • FLCOS technology shows promise for precise optical measurements and testing applications.