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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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Ge-polymer bridge waveguide for mode-locked laser pulse generation.

Jinyuan Liu, Zhenming Ding, Ziyang Zhang

    Optics Letters
    |February 1, 2024
    PubMed
    Summary
    This summary is machine-generated.

    A novel polymer-bridged laser system uses amorphous germanium (α-Ge) as a low-cost saturable absorber. This design achieves mode-locked laser output with compressed pulse widths and adjustable repetition rates.

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    Area of Science:

    • Photonics and Laser Technology
    • Materials Science

    Background:

    • Mode-locked lasers are crucial for applications requiring ultrashort pulses.
    • Developing compact, cost-effective, and tunable laser systems remains a key challenge.

    Purpose of the Study:

    • To introduce a novel "ternary" mode-locked laser system.
    • To demonstrate the application of amorphous germanium (α-Ge) as a passive saturable absorber.
    • To achieve a compact and tunable laser output.

    Main Methods:

    • Constructing a laser system using an indium phosphide (InP) gain chip, a fiber Bragg grating (FBG), and a Ge-polymer hybrid waveguide.
    • Integrating a 50-nm amorphous Ge (α-Ge) layer within the hybrid waveguide to act as a saturable absorber.
    • Utilizing a femtosecond laser transmission experiment to verify pulse width compression.

    Main Results:

    • Demonstrated a mode-locked laser output with a repetition rate around 50 MHz.
    • Achieved a pulse width of 147 ps with a signal-to-noise ratio greater than 50 dB.
    • Verified the pulse width compression effect of the α-Ge layer.

    Conclusions:

    • The developed polymer-bridged laser system offers a compact and tunable solution for pulsed laser generation.
    • Amorphous germanium (α-Ge) films are proven to be feasible, practical, and low-cost saturable absorbers for photonic devices.
    • This work highlights the potential of discrete photonic components integrated via polymer waveguides.