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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Fiber-based two-wavelength heterodyne laser interferometer.

Yanqi Zhang, Felipe Guzman

    Optics Express
    |October 19, 2022
    PubMed
    Summary
    This summary is machine-generated.

    We developed a fiber-based two-wavelength heterodyne interferometer for precise displacement measurement. This compact sensor achieves a sensitivity of 7.5 pm/Hz, ideal for inertial sensing applications.

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    Area of Science:

    • Metrology
    • Optical Sensing
    • Fiber Optics

    Background:

    • Displacement measuring interferometry is essential for precision measurements.
    • Fiber-based systems offer compact and sensitive solutions.
    • Heterodyne interferometry provides high resolution for displacement sensing.

    Purpose of the Study:

    • To propose a fiber-based two-wavelength heterodyne interferometer for displacement sensing.
    • To enhance sensitivity and common-mode noise rejection in fiber optic sensors.
    • To investigate and mitigate periodic errors in interferometric measurements.

    Main Methods:

    • Constructing two heterodyne interferometers using distinct wavelengths (1064 nm and 1055 nm).
    • Utilizing a narrow-bandwidth spectral filter for beam path separation and noise rejection.
    • Implementing algorithms to correct for periodic errors from spectral separation imperfections.

    Main Results:

    • Achieved a sensitivity floor of 7.5 pm/Hz at 1 Hz in preliminary tests.
    • Demonstrated effective common-mode noise monitoring and environmental noise rejection.
    • Identified and proposed mitigation strategies for periodic errors.

    Conclusions:

    • The proposed fiber-based two-wavelength heterodyne interferometer is a compact and highly sensitive displacement sensor.
    • This technology is suitable for demanding applications like inertial sensing.
    • The developed methods improve the accuracy and reliability of optical displacement measurements.