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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Phase-shifting profilometry resistant to varying ambient light.

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    This study introduces a new phase-shifting method that works even with changing ambient light (AL). It accurately retrieves phase information by canceling background light variations, improving results in real-world conditions.

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    Area of Science:

    • Optical Metrology
    • Image Processing
    • Phase Measurement

    Background:

    • Conventional phase-shifting techniques assume constant ambient light (AL), limiting their use in variable lighting.
    • Practical applications frequently encounter non-uniform and time-varying AL, causing significant phase errors.

    Purpose of the Study:

    • To propose a novel phase-shifting method robust to varying ambient light (AL).
    • To enable accurate phase retrieval in challenging lighting conditions for optical metrology applications.

    Main Methods:

    • A new phase-shifting algorithm designed to cancel time-varying fringe backgrounds.
    • Utilizing specially designed phase shifts and difference operations on captured fringe images.
    • Suppression of both polynomial and non-polynomial AL variations.

    Main Results:

    • The proposed method effectively suppresses ambient light (AL) influence.
    • Achieved significant reduction in phase errors, up to 84.03%, compared to existing methods.
    • Demonstrated robustness and effectiveness in practical, complex lighting environments.

    Conclusions:

    • The novel phase-shifting method provides accurate phase retrieval under varying ambient light (AL).
    • This technique enhances the reliability of optical measurements in real-world scenarios with challenging illumination.