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Terahertz quantum cascade laser frequency combs with optical feedback.

Xiaoyu Liao, Xingguang Wang, Kang Zhou

    Optics Express
    |October 19, 2022
    PubMed
    Summary
    This summary is machine-generated.

    External optical feedback influences semiconductor quantum cascade laser (QCL) performance. This study reveals QCL frequency combs exhibit robust stability against minor feedback mirror vibrations, maintaining comb operation.

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    Area of Science:

    • Physics
    • Quantum Optics
    • Semiconductor Lasers

    Background:

    • Optical feedback is a critical factor influencing laser performance.
    • Semiconductor quantum cascade lasers (QCLs) are utilized in various spectroscopic applications.

    Purpose of the Study:

    • To investigate the frequency comb behavior of a 4.2 THz QCL under external optical feedback.
    • To analyze the impact of feedback strength, length, and phase on QCL inter-mode beatnotes and comb stability.

    Main Methods:

    • Experimental observation of inter-mode beatnote evolution with varying optical feedback.
    • Measurement and comparison of comb stability with and without optical feedback.
    • Numerical simulations to understand the underlying dynamics of optical feedback.

    Main Results:

    • A periodic evolution from single-line to multiple-line beatnotes was observed with minor changes in feedback length (phase).
    • Simulations confirmed that dynamical oscillations induced by feedback cause multiple-line beatnotes.
    • The characteristic feedback period is linked to half the laser's wavelength.

    Conclusions:

    • Terahertz QCL frequency combs demonstrate remarkable robustness against minor feedback mirror position vibrations.
    • Comb operation is maintained across a wide range of feedback length positions.
    • The inherent stability makes THz QCL combs practical for applications sensitive to environmental perturbations.