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Programmable controlled mode-locked fiber laser using a digital micromirror device.

Wu Liu, Jintao Fan, Chen Xie

    Optics Letters
    |May 16, 2017
    PubMed
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    A digital micromirror device (DMD) programmable filter enables tunable dispersion and watt-level output power in fiber lasers. This technology achieves femtosecond pulse generation with controllable wavelength and bandwidth, enhancing mode-locking flexibility.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Materials Science

    Background:

    • Mode-locking in fiber lasers is crucial for generating ultrashort pulses.
    • Controlling laser dispersion and spectral properties is key to pulse shaping.
    • Digital micromirror devices (DMDs) offer programmable optical filtering capabilities.

    Purpose of the Study:

    • To integrate a DMD-based arbitrary spectrum amplitude shaper into a fiber laser cavity.
    • To investigate the DMD shaper's ability to control laser dispersion and pulse characteristics.
    • To achieve high-power, tunable femtosecond pulse generation through programmable filtering.

    Main Methods:

    • Incorporation of a DMD-based amplitude shaper as an in-cavity filter in a large-mode-area photonic crystal fiber laser.
    • Programming diverse filter profiles onto the DMD to manipulate the laser spectrum.
    • Adjusting cavity dispersion and pump power to achieve mode-locking and spectral shaping.

    Main Results:

    • Successful mode-locking was achieved across a wide range of tunable dispersion (normal to anomalous).
    • Watt-level output power was obtained with femtosecond pulse generation.
    • Tunable central wavelength and controllable bandwidth of the generated pulses were demonstrated.
    • Design-shaped spectra were directly achieved by varying the DMD filter's amplitude transfer function.

    Conclusions:

    • The DMD-based in-cavity filter provides versatile and flexible control over pulse dynamics in mode-locked fiber lasers.
    • This approach enables precise manipulation of spectral amplitude and laser dispersion.
    • The technology facilitates the generation of tailored femtosecond pulses for various applications.