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Fiber taper diameter characterization using forward Brillouin scattering.

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    We developed a fast, non-destructive method using Brillouin scattering to measure fiber taper diameter and uniformity. This technique precisely characterizes micrometer-scale fibers, crucial for optical applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Acoustic Metrology

    Background:

    • Accurate characterization of micrometer-scale fiber tapers is essential for optical device performance.
    • Existing methods for diameter and uniformity assessment can be slow, destructive, or lack precision.

    Purpose of the Study:

    • To introduce a rapid and non-destructive optical technique for absolute diameter and uniformity characterization of fiber tapers.
    • To establish a method based on acoustic wave properties within the fiber.

    Main Methods:

    • Utilizing a pump and probe forward Brillouin scattering setup.
    • Exciting the fundamental torsional-radial acoustic mode with a pulsed pump laser.
    • Analyzing polarization modulation on a probe signal to determine spectral structure, diameter, and non-uniformity.

    Main Results:

    • Demonstrated a relative deviation of 1% or less compared to scanning electron microscopy measurements.
    • Achieved detection of diameter non-uniformity below 0.5%.
    • Established an inverse relationship between acoustic mode frequency and taper waist diameter.

    Conclusions:

    • The proposed Brillouin scattering method offers a fast, non-destructive, and highly accurate approach for fiber taper metrology.
    • This technique is suitable for real-time quality control and characterization of micrometer-scale optical fibers.