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Continuously tunable distributed feedback polymer laser.

Tianrui Zhai, Fengzhao Cao, Saisai Chu

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    |February 25, 2018
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    Summary
    This summary is machine-generated.

    A novel fan-shaped structure enables continuous tuning of polymer laser output wavelengths. This tunable laser technology, fabricated using electron beam lithography, offers potential for compact laser sources.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Developing tunable laser sources is crucial for various photonic applications.
    • Polymer lasers offer advantages like low cost and mechanical flexibility.
    • Achieving continuous wavelength tuning in polymer lasers remains a challenge.

    Purpose of the Study:

    • To propose and demonstrate a continuously tunable polymer laser using a fan-shaped distributed feedback cavity.
    • To investigate the wavelength tuning mechanism based on the fan-shaped structure's gradual period.
    • To explore the potential of this technology for compact laser sources.

    Main Methods:

    • Fabrication of a fan-shaped cavity with gradually varying periods using electron beam lithography.
    • Spin-coating a light-emitting polymer to form the active layer.
    • Pumping the laser with a focused cylindrical lens and analyzing output wavelength shifts.

    Main Results:

    • Continuous tuning of the polymer laser output wavelength from 584 nm to 552 nm was achieved by shifting the pump stripe position.
    • The observed tuning behavior correlated with the changing period of the fan-shaped cavity, consistent with Bragg condition.
    • The structure demonstrated effective distributed feedback for the polymer laser.

    Conclusions:

    • The fan-shaped structure provides an effective method for continuously tuning polymer laser wavelengths.
    • This approach offers a pathway towards realizing compact and tunable polymer laser devices.
    • The findings contribute to the advancement of tunable laser technologies.