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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Optical interruption of a quantum cascade laser for cavity ring-down spectroscopy.

Teemu Kääriäinen, Guillaume Genoud

    Optics Letters
    |November 2, 2019
    PubMed
    Summary

    We show how to optically interrupt a quantum cascade laser (QCL) resonance using a near-infrared (NIR) laser. This all-optical method matches conventional techniques but needs less demanding QCL driver bandwidth for mid-infrared (MIR) spectroscopy.

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    Area of Science:

    • Optics
    • Spectroscopy
    • Quantum Cascade Lasers

    Background:

    • Cavity ring-down spectroscopy (CRDS) is a powerful technique for sensitive gas detection.
    • Quantum cascade lasers (QCLs) are widely used as light sources in mid-infrared (MIR) spectroscopy.
    • Traditional CRDS methods often rely on current modulation for cavity interruption, which can be bandwidth-intensive.

    Purpose of the Study:

    • To demonstrate a novel all-optical method for interrupting cavity resonance in a MIR QCL-based spectrometer.
    • To compare the performance of optical interruption with conventional current-step modulation.
    • To explore the potential for reduced driver bandwidth requirements in MIR laser spectroscopy.

    Main Methods:

    • Injection of a low-power near-infrared (NIR) laser diode into a MIR QCL cavity.
    • Modulation of QCL amplitude and frequency via NIR laser injection.
    • Measurement of cavity ring-down times to compare optical interruption with current-step modulation.
    • Utilizing a high-finesse optical cavity coupled with a 4.5 μm QCL.

    Main Results:

    • Successful optical unlocking of cavity resonance was achieved using a 1310 nm NIR laser.
    • The all-optical method demonstrated comparable performance to conventional current modulation.
    • Significantly reduced bandwidth requirements for the QCL driver were observed with the optical method.

    Conclusions:

    • Optical interruption of cavity resonance in MIR QCL spectrometers is feasible and effective.
    • This all-optical approach offers advantages in terms of reduced driver bandwidth.
    • The method holds promise for advancing MIR laser spectroscopy and enabling new applications.