Optical interruption of a quantum cascade laser for cavity ring-down spectroscopy

Teemu Kääriäinen (Corresponding Author), Guillaume Genoud

    Research output: Contribution to journalArticleScientificpeer-review


    We demonstrate optical unlocking of a cavity resonance in a mid-infrared (MIR) quantum cascade laser (QCL) cavity ring-down spectrometer using a low-power multimode near-infrared (NIR) laser diode. A NIR laser with a center wavelength of 1310 nm is injected into a QCL whose amplitude and frequency are modulated as a result. The shift in frequency leads to a rapid interruption of the cavity resonance. The optical method is compared to cavity interruption with a current step by measuring ring-down times in a high-finesse optical cavity, coupled with a QCL with a center wavelength of 4.5 μm. The results indicate the comparable performance of the all-optical method with the more conventional current modulation, but with significantly reduced bandwidth requirements for the QCL driver, opening the way to other potential applications in MIR laser spectroscopy.

    Original languageEnglish
    Pages (from-to)5294-5297
    JournalOptics Letters
    Issue number21
    Publication statusPublished - 28 Oct 2019
    MoE publication typeA1 Journal article-refereed


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