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Vertical-cavity organic lasers with distributed-feedback structures based on active Bragg reflectors.

H Sakata, H Takeuchi, K Natsume

    Optics Express
    |June 17, 2009
    PubMed
    Summary

    Researchers developed optically pumped organic thin-film lasers using doped Bragg reflectors. This novel approach achieved single-longitudinal-mode operation and reduced laser threshold by 30%.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Organic Electronics

    Background:

    • Optically pumped organic lasers offer tunable emission and low-cost fabrication.
    • Developing efficient and stable organic laser devices remains a challenge.
    • Bragg reflectors are crucial for laser cavity design and performance.

    Purpose of the Study:

    • To fabricate and characterize optically pumped organic thin-film lasers.
    • To investigate the effect of doping Bragg reflectors on laser performance.
    • To achieve single-longitudinal-mode operation in organic lasers.

    Main Methods:

    • Fabrication of multilayer thin-film structures comprising Bragg reflectors and an active layer.
    • Doping of Bragg reflectors and the active layer with pyrromethene-567 dye.
    • Optical pumping and spectral analysis to determine laser characteristics.

    Main Results:

    • Successful fabrication of optically pumped organic thin-film lasers.
    • Observation of single-longitudinal-mode laser operation at 555 nm.
    • A 30% reduction in laser threshold was achieved with doped Bragg reflectors compared to undoped ones.

    Conclusions:

    • Doping Bragg reflectors with pyrromethene-567 dye enhances the performance of organic thin-film lasers.
    • The experimental results align with theoretical calculations, validating the design.
    • This work demonstrates a promising strategy for improving organic laser efficiency and mode control.