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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Synchronization of frequency combs by optical injection.

Johannes Hillbrand, Mathieu Bertrand, Valentin Wittwer

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

    Stabilizing offset frequencies in semiconductor laser optical frequency combs is crucial for dual-comb spectroscopy. This study demonstrates synchronized offset frequencies using optical injection locking, enabling phase-stabilized dual-comb spectrometers.

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    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Laser Physics

    Background:

    • Semiconductor laser optical frequency combs offer monolithic integration for dual-comb spectrometers.
    • Stabilizing the offset frequency (fceo) is challenging due to limited spectral bandwidth, causing signal degradation and complex processing.
    • Current dual-comb configurations suffer from uncorrelated frequency jitter, leading to broadened beatnotes and low signal-to-noise ratios (SNR).

    Purpose of the Study:

    • To demonstrate a novel method for synchronizing the offset frequencies of two optical frequency combs.
    • To achieve full phase-stabilization in dual-comb spectrometers by combining optical and electrical injection locking.
    • To enable simpler data acquisition and processing for dual-comb spectroscopy.

    Main Methods:

    • Utilizing optical injection locking with a master oscillator derived from a single comb line isolated by an optical Vernier filter.
    • Implementing electrical injection locking for the repetition frequencies (frep) of both combs.
    • Employing analog electronics for coherent averaging of the stabilized dual-comb signal.

    Main Results:

    • Achieved synchronized and phase-stabilized offset frequencies for two optical frequency combs.
    • Demonstrated a periodic and stable dual-comb signal over thousands of periods.
    • Significantly increased SNR by orders of magnitude and reduced data size, enabling efficient coherent averaging.

    Conclusions:

    • The presented optical injection locking technique enables fully phase-stabilized dual-comb spectrometers.
    • This method simplifies data acquisition and processing, reducing hardware complexity and cost.
    • Provides a pathway for comparing and stabilizing offset frequencies to narrow-linewidth optical references.