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Random fiber laser based on a partial-reflection random fiber grating for high temperature sensing.

Jiancheng Deng, D V Churkin, Zuowei Xu

    Optics Letters
    |March 2, 2021
    PubMed
    Summary

    A novel random fiber laser (RFL) using a unique partial-reflection random fiber grating (PR-RFG) enables stable, single-wavelength operation for high-temperature sensing. This innovative RFL demonstrates reliable performance up to 500°C.

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    Area of Science:

    • Photonics and Optical Engineering
    • Sensing Technologies
    • Materials Science

    Background:

    • Fiber lasers offer robust platforms for various applications.
    • High-temperature sensing requires stable and reliable optical devices.
    • Random fiber gratings provide unique spectral properties for laser design.

    Purpose of the Study:

    • To propose and demonstrate a stable single-wavelength random fiber laser (RFL) for high-temperature sensing.
    • To investigate the use of a partial-reflection random fiber grating (PR-RFG) for laser stabilization.
    • To evaluate the performance of the RFL in a wide temperature range.

    Main Methods:

    • Fabrication of a PR-RFG using a femtosecond laser.
    • Design of the PR-RFG with a significantly higher primary reflection peak.
    • Characterization of the RFL's stability, threshold, and temperature sensing capabilities.
    • Theoretical calculations for PR-RFG reflectivity optimization (30%-90%).

    Main Results:

    • Demonstration of a stable, filter-free, single-wavelength RFL.
    • Achieved a low lasing threshold of 6.4 mW.
    • Successful temperature sensing from 25°C to 500°C.
    • Obtained a high optical signal-to-noise ratio (SNR) of up to 70 dB.

    Conclusions:

    • The proposed PR-RFG is effective in ensuring the stability of a filter-free RFL.
    • The developed RFL is suitable for high-temperature sensing applications.
    • The PR-RFG design offers a promising approach for stable fiber laser development.