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Micro-drilling hollow-core fiber using image processing for rotational alignment.

Eleanor A Warrington, Patrick S Salter, William O C Davis

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    |June 14, 2025
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    Summary
    This summary is machine-generated.

    A new image processing method precisely aligns microchannels in hollow-core anti-resonant fibers for enhanced gas detection. This technique minimizes signal loss and improves sensor performance for applications like atmospheric mapping.

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    Area of Science:

    • Optical Fiber Technology
    • Photonics
    • Sensing Technologies

    Background:

    • Anti-resonant hollow-core fibers offer high sensitivity for gas detection but face challenges balancing sensitivity and response time.
    • Fabricating microchannels in these fibers improves response time but risks damaging the fiber's guiding structure and causing signal loss.
    • Accessing the fiber core for microchannel integration without compromising structural integrity is a significant hurdle.

    Purpose of the Study:

    • To develop a non-invasive method for determining the rotational orientation of hollow-core anti-resonant fibers.
    • To enable accurate microchannel fabrication within the fiber's capillary gaps, minimizing optical loss.
    • To demonstrate the method's adaptability across different fiber types and microchannel designs.

    Main Methods:

    • An image processing and cross-correlation technique was employed to ascertain fiber rotational orientation without direct cross-section access.
    • The alignment method was validated on both coated and uncoated hollow-core anti-resonant fibers.
    • Microchannels of 5 × 50 µm were successfully fabricated in commercial and in-house fibers using the developed alignment technique.

    Main Results:

    • The image processing method accurately determined fiber orientation, allowing precise microchannel insertion between capillary gaps.
    • Fabrication of microchannels was achieved with minimal optical loss, preserving the fiber's guiding properties.
    • The method proved effective for both coated and uncoated fibers, with coated fibers showing superior structural integrity after micro-drilling.

    Conclusions:

    • The developed image processing and cross-correlation method provides a reliable means for orienting hollow-core anti-resonant fibers for microchannel integration.
    • This technique facilitates the fabrication of improved gas sensors with reduced response times and minimal signal loss.
    • The alignment method holds potential for broader applications in optical fiber machining and the development of advanced sensing systems.