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Narrow-linewidth quantum cascade laser at 8.6 μm.

Eugenio Fasci, Nicola Coluccelli, Marco Cassinerio

    Optics Letters
    |August 15, 2014
    PubMed
    Summary
    This summary is machine-generated.

    We developed a narrow-linewidth quantum cascade laser (QCL) with exceptional spectral purity. This laser, locked to an optical cavity, achieves a linewidth under 4 kHz and minimal frequency noise for advanced applications.

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    Area of Science:

    • Quantum optics
    • Laser physics
    • Spectroscopy

    Background:

    • Quantum cascade lasers (QCLs) are crucial for mid-infrared applications.
    • Achieving narrow linewidths and high spectral purity in QCLs remains a challenge.
    • Optical cavities enhance laser performance but require precise locking mechanisms.

    Purpose of the Study:

    • To demonstrate a narrow-linewidth distributed-feedback quantum cascade laser (QCL) at 8.6 μm.
    • To achieve optical-feedback locking of the QCL to a high-finesse V-shaped cavity.
    • To comprehensively characterize the spectral purity and frequency noise of the locked QCL.

    Main Methods:

    • Utilized a distributed-feedback quantum cascade laser operating at 8.6 μm.
    • Implemented an optical-feedback locking scheme to a high-finesse V-shaped cavity.
    • Employed a high-sensitivity optical frequency discriminator for spectral purity characterization.

    Main Results:

    • Achieved a 1 ms linewidth of less than 4 kHz for the locked QCL.
    • Measured a minimum laser frequency noise spectral density of 0.01 Hz²/Hz for Fourier frequencies > 100 kHz.
    • Demonstrated cumulative standard deviation of laser intensity better than 0.1% over a 2 Hz to 100 MHz bandwidth.

    Conclusions:

    • The optical-feedback locking technique significantly enhances the spectral purity of the 8.6 μm QCL.
    • The characterized low frequency noise and narrow linewidth are suitable for high-precision spectroscopic measurements.
    • The demonstrated intensity stability further broadens the potential applications in demanding optical systems.