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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

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Published on: January 28, 2019

Self-mixing interferometer based on sinusoidal phase modulating technique.

Dongmei Guo, Ming Wang, Suqing Tan

    Optics Express
    |June 5, 2009
    PubMed
    Summary
    This summary is machine-generated.

    A novel self-mixing interferometer uses sinusoidal phase modulation for precise displacement measurements. This technique achieves sub-10nm accuracy, offering a new tool for high-precision metrology.

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    Published on: August 12, 2013

    Area of Science:

    • Optical Metrology
    • Laser Interferometry
    • Precision Measurement

    Background:

    • Self-mixing interferometry (SMI) leverages internal laser feedback for sensing.
    • Traditional SMI methods face limitations in accuracy and signal processing.
    • External cavity modulation offers enhanced control over interference signals.

    Purpose of the Study:

    • To introduce a new self-mixing interferometry system.
    • To utilize sinusoidal phase modulation for improved measurement performance.
    • To demonstrate high-accuracy displacement measurement capabilities.

    Main Methods:

    • Implemented a self-mixing interferometer with an external cavity.
    • Employed an electro-optic modulator (EOM) for sinusoidal phase modulation.
    • Utilized Fourier analysis for accurate phase calculation of the interference signal.

    Main Results:

    • Achieved displacement measurement accuracy of less than 10 nanometers.
    • Successfully measured the displacement of a commercial piezoelectric transducer (PZT).
    • Demonstrated the feasibility of the sinusoidal phase modulation technique in SMI.

    Conclusions:

    • The presented self-mixing interferometer with sinusoidal phase modulation offers high-precision displacement sensing.
    • The system's measurement range is primarily limited by EOM frequency and A/D converter sampling rate.
    • This technique provides a viable alternative for sub-10nm accuracy metrology applications.