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Updated: Oct 28, 2025

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Radial shearing speckle pattern interference system based on a spatial light modulator.

Shuangle Wu, Chen Li, Haotian Xie

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    A novel radial shearing speckle pattern interferometry system uses a spatial light modulator for flexible, arbitrary defect detection. This advanced nondestructive testing method accurately identifies defects in all directions without prior orientation requirements.

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    Area of Science:

    • Optical metrology
    • Interferometry
    • Speckle pattern analysis

    Background:

    • Traditional shearing interferometry often requires specific defect orientations.
    • Nondestructive testing (NDT) demands versatile defect detection capabilities.

    Purpose of the Study:

    • To introduce a new radial shearing speckle pattern interference system.
    • To enable arbitrary and rapid adjustment of shearing parameters for enhanced NDT.
    • To achieve simultaneous, multi-directional defect detection.

    Main Methods:

    • Utilizing a spatial light modulator (SLM) to introduce radial shearing.
    • Implementing a four-step temporal phase shift method for phase modulation.
    • Controlling SLM modulation via programming for adjustable shearing information.

    Main Results:

    • Demonstrated feasibility and practicability of the proposed system through experiments.
    • Achieved arbitrary adjustment of shearing information for measurement needs.
    • Enabled defect detection independent of defect orientation.

    Conclusions:

    • The developed radial shearing system offers a significant advancement in nondestructive testing.
    • The system provides accurate, all-directional defect detection capabilities.
    • Programmable SLM control allows for flexible and efficient interferometric measurements.