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Fiber Reinforced Concrete01:22

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Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
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Updated: Dec 7, 2025

In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
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Chalcogenide fibers for Kerr squeezing.

Elena A Anashkina, Alexey V Andrianov, Joel F Corney

    Optics Letters
    |October 1, 2020
    PubMed
    Summary

    We theoretically demonstrate Kerr squeezing of 2 µm light in chalcogenide fibers. These novel fibers offer significantly reduced attenuation and enhanced nonlinearity for improved quantum optical applications.

    Area of Science:

    • Quantum optics
    • Materials science
    • Photonics

    Background:

    • Kerr squeezing is a quantum optical technique to reduce photon number uncertainty.
    • Chalcogenide fibers offer high nonlinearity but suffer from high attenuation.
    • Standard telecommunication fibers have limited nonlinearity for efficient squeezing.

    Purpose of the Study:

    • To theoretically investigate Kerr squeezing of 2 µm light in novel chalcogenide fibers.
    • To design low-loss, single-mode chalcogenide fibers with enhanced nonlinear properties.
    • To estimate optimal squeezing parameters for continuous wave laser signals.

    Main Methods:

    • Theoretical modeling of nonlinear optical effects in optical fibers.
    • Design of step-index single-mode chalcogenide fibers.

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  • Calculation of nonlinear Kerr coefficient and attenuation.
  • Estimation of squeezing levels based on fiber parameters.

    • Main Results:

    • Proposed designs for low-loss chalcogenide fibers with 3-4 orders of magnitude higher nonlinear Kerr coefficient than standard fibers.
    • Demonstrated feasibility of Kerr squeezing at 2 µm wavelength.
    • Identified As2S3 and As2Se3 glasses as suitable materials.

    Conclusions:

    • Chalcogenide fibers with reduced attenuation and high nonlinearity are promising for efficient Kerr squeezing.
    • The proposed fiber designs enable enhanced quantum optical measurements at 2 µm.
    • This research advances the development of practical quantum light sources.