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Laser interferometry velocimetry with high spatiotemporal resolution based on spatial dispersion.

Long Chen, Cangli Liu, Yong Wang

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    |August 13, 2025
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    Summary

    Researchers developed a new laser interferometric velocimetry technique for precise, high-resolution material analysis. This breakthrough enhances transient velocity measurement for shock wave physics studies at the micromesoscopic scale.

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    Area of Science:

    • Shock wave physics
    • Materials science
    • Optical diagnostics

    Background:

    • Advancements in shock wave physics necessitate higher performance diagnostic technologies for micromesoscopic material analysis.
    • Microstructure and defects at the tens-to-hundreds of micrometers scale require high spatiotemporal resolution measurement.
    • Existing scattered point measurement techniques have limitations in resolution and dimensionality.

    Purpose of the Study:

    • To develop an advanced transient velocity measurement technology with high spatial and temporal resolution.
    • To overcome the limitations of current diagnostic methods in shock wave physics.
    • To enable higher dimensional and precision experimental studies of high-pressure material properties.

    Main Methods:

    • Design of a multi-wavelength narrow linewidth continuous wave (CW) laser.
    • Development of a spatial dispersion probe for high spatial resolution measurement within a single optical fiber.
    • Implementation of spatial frequency domain laser interferometry by mapping the frequency and space domains.

    Main Results:

    • Achieved high spatial resolution measurement in a single optical fiber, surpassing existing methods.
    • Realized a breakthrough in laser interferometric velocimetry across time, frequency, and space domains.
    • Demonstrated a spatial resolution better than 35 microns for transient velocity measurements.

    Conclusions:

    • The developed spatial frequency domain laser interferometry provides crucial technical support for high-dimensional, high-precision experimental studies.
    • This technique advances the understanding of shock compression response characteristics of materials at the micromesoscopic scale.
    • Enables more detailed investigation into the physical properties of high-pressure materials.