Supercontinuum based mid-infrared OCT, spectroscopy, and hyperspectral imaging

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    Abstract

    Mid-infrared (MIR) spatially coherent supercontinuum (SC) fiber lasers with high brightness and average power find important applications in spectroscopy-based trace gas detection, such as in pollution and food-quality monitoring. Early commercial MIR SC lasers have been limited to about 4.5m, mainly by the transmission bandwidth of the fluoride fibers typically used for the SC generation. Research-based MIR SC lasers have reached 15m, but with very low power and/or bulky and expensive pump lasers, making them irrelevant for applications. Recently the use of SC cascading in a combination of fluoride and chalcogenide fibers have seen MIR SC lasers reaching 11m with average powers around 100mW and high repetition rates [1], [2]. Here we review the state-of-the art in MIR SC lasers and demonstrate a design that provides MHz repetition rates while not using any amplifier along the fiber chain, which makes it simple, cheap and robust [2] [see spectrum in Fig. 1(g) ]. Such MHz MIR SC lasers covering most of the molecular fingerprint region are ideal for hyperspectral imaging [3] [see Fig. 1(a-f) ] and real-time Optical Coherence tomography (OCT) when combined with ultra-fast upconversion detectors [4] [see Fig. 1(h-k) ]. We present the latest results within these two particular applications, as well as in spectroscopy based trace-gas detection.

    Original languageEnglish
    Title of host publicationProceedings of 2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference
    PublisherIEEE
    Publication dateJun 2021
    ISBN (Electronic)9781665418768
    DOIs
    Publication statusPublished - Jun 2021
    Event2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference - Virtual event, Munich, Germany
    Duration: 21 Jun 202125 Jun 2021
    https://www.cleoeurope.org/

    Conference

    Conference2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference
    LocationVirtual event
    Country/TerritoryGermany
    CityMunich
    Period21/06/202125/06/2021
    Internet address

    Bibliographical note

    Publisher Copyright:
    © 2021 IEEE.

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