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Related Experiment Video

Updated: Nov 28, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Mid-infrared quantum cascade laser frequency combs based on multi-section waveguides.

Ruijun Wang, Philipp Täschler, Filippos Kapsalidis

    Optics Letters
    |December 1, 2020
    PubMed
    Summary
    This summary is machine-generated.

    Engineered quantum cascade laser (QCL) waveguides manage dispersion for stable frequency comb operation. This breakthrough offers high power and broad bandwidth, advancing laser technology.

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    Area of Science:

    • Quantum optics
    • Semiconductor device physics

    Background:

    • Quantum cascade lasers (QCLs) are semiconductor sources for mid-infrared light.
    • Frequency combs require precise control over laser dispersion for stable operation.
    • Managing group velocity dispersion (GVD) is crucial for QCL frequency comb performance.

    Purpose of the Study:

    • To engineer QCL waveguides for dispersion management.
    • To achieve stable, continuous frequency comb operation in QCLs.
    • To enhance output power and optical bandwidth of QCL frequency combs.

    Main Methods:

    • Designing multi-section waveguides with varying widths.
    • Utilizing waveguide geometry to engineer a flat and slightly negative GVD.
    • Characterizing comb operation, beatnotes, output power, and spectral bandwidth.

    Main Results:

    • Achieved continuous frequency comb operation over a wide dynamic range.
    • Observed strong, narrow-linewidth intermode beatnotes across a >300 mA current range.
    • Demonstrated high output power (>380 mW) and wide optical bandwidth (>55 cm⁻¹).

    Conclusions:

    • Engineered waveguides effectively manage dispersion in QCLs.
    • The developed QCL frequency comb exhibits robust and high-performance characteristics.
    • This work paves the way for advanced QCL-based frequency comb applications.