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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Tunable comb operation in terahertz quantum cascade ring lasers.

Michael Jaidl, Dominik Theiner, Florian Pilat

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    |November 11, 2025
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    Summary
    This summary is machine-generated.

    Researchers created a tunable terahertz frequency comb using radio frequency modulation on a quantum cascade laser. This compact, efficient method offers precise control for spectroscopy and communications.

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    Area of Science:

    • Terahertz (THz) science and technology
    • Quantum cascade lasers (QCLs)
    • Optoelectronics

    Background:

    • Terahertz frequency combs are crucial for high-resolution spectroscopy and sensing.
    • Generating and controlling THz combs with tunable spacing remains a challenge.

    Purpose of the Study:

    • To demonstrate a versatile and compact method for generating and controlling THz frequency combs.
    • To explore the use of radio frequency (RF) modulation in ring-shaped quantum cascade lasers (QCLs) for THz comb generation.

    Main Methods:

    • Applying harmonic RF modulation to a ring-shaped QCL above its lasing threshold.
    • Analyzing the generated phase-coherent sidebands and their spectral properties.
    • Measuring beat note linewidths and phase profiles.

    Main Results:

    • Achieved tunable THz frequency comb spacing from 1.5-14.5 GHz, independent of cavity modes.
    • Observed narrow beat notes with linewidths as low as 3.5 Hz and a linear phase profile.
    • Demonstrated increased THz output power and laser efficiency with RF modulation.

    Conclusions:

    • RF-modulated QCLs offer a flexible and efficient approach to generating customizable THz frequency combs.
    • This technique shows significant potential for applications in spectroscopy, sensing, and communication systems.
    • The method enables precise control over spectral grids and power distribution.