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Mode-locked all-fiber laser producing radially polarized rectangular pulses.

Biao Sun, Anting Wang, Chun Gu

    Optics Letters
    |April 15, 2015
    PubMed
    Summary

    We developed a new fiber laser that produces tunable rectangular pulses with high polarization purity. This radially polarized laser utilizes a figure-8 cavity and fiber Bragg gratings for advanced optical applications.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Fiber Lasers

    Background:

    • Mode-locked fiber lasers are crucial for various applications requiring precise pulse generation.
    • Achieving high polarization purity in fiber laser outputs remains a challenge.
    • Radially polarized beams offer unique advantages in applications like particle acceleration and microscopy.

    Purpose of the Study:

    • To propose and demonstrate a novel radially polarized mode-locked fiber laser.
    • To achieve tunable rectangular pulse generation with high polarization purity.
    • To investigate the performance of a figure-8 cavity combined with cascade fiber Bragg gratings for mode-locking.

    Main Methods:

    • Utilized a figure-8 cavity configuration for stable mode-locking.
    • Employed cascade fiber Bragg gratings (FBGs) to achieve radial polarization.
    • Investigated the effect of pump power on pulse width and other laser parameters.
    • Characterized the output pulses, including width, linewidth, and polarization purity.

    Main Results:

    • Successfully demonstrated a radially polarized mode-locked fiber laser.
    • Generated rectangular pulses with a tunable width ranging from 2.8 to 23 ns.
    • Achieved a narrow 30-dB linewidth of 0.2 nm at 1056.3 nm.
    • Obtained a high polarization purity of 96% for the output transverse mode.

    Conclusions:

    • The proposed laser design effectively generates tunable, high-purity radially polarized pulses.
    • The combination of a figure-8 cavity and cascade FBGs is a viable method for creating such lasers.
    • This laser technology holds promise for advanced optical applications demanding specific polarization states and pulse characteristics.