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Monolithic multi-wavelength lasing from multi-sized microdisk lasers.

Wai Yuen Fu, Yuk Fai Cheung, Hoi Wai Choi

    Optics Letters
    |December 20, 2022
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    Summary
    This summary is machine-generated.

    This study achieved monolithic multi-wavelength lasing using varied microdisk sizes. Different microdisk dimensions alter strain relaxation, enabling tunable light emission for advanced photonic devices.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Semiconductor Physics

    Background:

    • Microdisk resonators are crucial for photonic integrated circuits.
    • Controlling strain in microdisks influences their optical properties.
    • Quantum confined Stark effect impacts semiconductor emission spectra.

    Purpose of the Study:

    • To demonstrate monolithic multi-wavelength lasing in green-emitting thin films.
    • To investigate the effect of microdisk size on strain relaxation and optical output.
    • To achieve simultaneous lasing at multiple wavelengths through controlled fabrication.

    Main Methods:

    • Fabrication of multi-sized microdisks on a green-emitting thin film.
    • Room-temperature optical pumping of microdisk resonators.
    • Characterization of lasing thresholds, Q factors, and Raman spectra.

    Main Results:

    • Achieved lasing thresholds of 15.1, 2.9, and 5.3 mJ/cm² for 950 nm, 6 μm, and 10 μm microdisks, respectively.
    • Observed Q factors of 2370, 2060, and 4308.
    • Confirmed strain relaxation via Raman spectroscopy, showing a shift in the E₂ (high) peak with decreasing microdisk diameter.

    Conclusions:

    • Monolithic multi-wavelength lasing is feasible by controlling microdisk dimensions.
    • Strain relaxation significantly impacts emission spectra and lasing properties.
    • This work offers a pathway for developing tunable, multi-wavelength light sources.