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Writing Bragg Gratings in Multicore Fibers
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Single-mode sapphire fiber Bragg grating.

Mohan Wang, Patrick S Salter, Frank P Payne

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    |April 27, 2022
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    Summary
    This summary is machine-generated.

    Researchers developed single-mode sapphire fiber Bragg gratings for extreme environments. This innovation enables accurate remote sensing by overcoming multimode limitations in sapphire optical fibers.

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    Area of Science:

    • Materials Science
    • Optical Engineering
    • Photonics

    Background:

    • Sapphire optical fibers offer excellent high-temperature and radiation resistance.
    • Multimode nature of sapphire fibers limits sensing applications.
    • Bragg gratings in sapphire fibers typically show multiple, unstable reflection peaks.

    Purpose of the Study:

    • To create single-mode waveguides with Bragg gratings in sapphire optical fibers.
    • To enable precise remote sensing in ultra-extreme environments.
    • To overcome the limitations of multimode sapphire fibers for sensing.

    Main Methods:

    • Utilized femtosecond laser direct writing.
    • Employed adaptive beam shaping with a non-immersion objective.
    • Developed a novel multi-layer depressed cladding design.
    • Fabricated waveguides with Bragg gratings within a 425 µm sapphire fiber.

    Main Results:

    • Achieved narrow bandwidth Bragg gratings (<0.5 nm).
    • Demonstrated grating survival after annealing at 1000°C.
    • Successfully created single-mode sapphire fiber Bragg gratings.
    • The design operates within the 1550 nm telecommunications waveband.

    Conclusions:

    • The developed single-mode sapphire fiber Bragg gratings are suitable for high-temperature and high-radiation sensing.
    • This technology significantly enhances the potential for accurate remote sensing in harsh conditions.
    • The novel cladding design effectively addresses the multimode issue in sapphire fibers.