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Broadly tunable Tm/Ho-codoped fiber lasers based on temperature-sensitive single-mode-multimode-single-mode fiber

Hajime Sakata, Fuma Kosaka, Kohei Hayakawa

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    Researchers developed all-fiber tunable lasers using novel single-mode-multimode-single-mode structures. Temperature control of liquid claddings enabled a 100 nm wavelength tuning range for these advanced fiber lasers.

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    Area of Science:

    • Photonics and Laser Technology
    • Materials Science
    • Optical Engineering

    Background:

    • Fiber lasers offer versatile light sources for various applications.
    • Wavelength tunability is crucial for many spectroscopic and communication systems.
    • Existing tunable laser technologies often face limitations in range, stability, or complexity.

    Purpose of the Study:

    • To demonstrate a novel all-fiber tunable laser architecture.
    • To investigate the use of liquid claddings in fiber laser structures for wavelength control.
    • To achieve a broad tuning range in fiber lasers using thermo-optic effects.

    Main Methods:

    • Fabrication of single-mode-multimode-single-mode (SMS) fiber structures.
    • Incorporation of liquid claddings with large thermo-optic coefficients within the multimode section.
    • Utilizing Tm/Ho-codoped fiber ring resonators for laser oscillation.
    • Precisely controlling the temperature of the SMS structures to tune the laser wavelength.

    Main Results:

    • Successfully demonstrated all-fiber tunable lasers based on SMS structures.
    • Achieved a significant wavelength tuning range of 100 nm.
    • Tuned the laser oscillation wavelength from 1858 nm to 1958 nm.
    • Validated the effectiveness of thermo-optic liquid claddings for laser wavelength control.

    Conclusions:

    • The proposed SMS fiber laser design offers a practical and effective method for achieving broad wavelength tunability.
    • Thermo-optic liquid claddings are a promising approach for developing advanced tunable fiber laser systems.
    • This technology has potential applications in spectroscopy, optical sensing, and telecommunications.