Mid-infrared supercontinuum covering the 1.4–13.3 μm molecular fingerprint region using ultra-high NA chalcogenide step-index fibre

Christian Rosenberg Petersen, Uffe Visbech Møller, Irnis Kubat, Binbin Zhou, Sune Dupont, Jacob Søndergaard Ramsay, Trevor Benson, Slawomir Sujecki, Nabil Abdel-Moneim, Zhuoqi Tang, David Furniss, Angela Seddon, Ole Bang

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    Abstract

    The mid-infrared spectral region is of great technical and scientific interest because most molecules display fundamental vibrational absorptions in this region, leaving distinctive spectral fingerprints. To date, the limitations of mid-infrared light sources such as thermal emitters, low-power laser diodes, quantum cascade lasers and synchrotron radiation have precluded mid-infrared applications where the spatial coherence, broad bandwidth, high brightness and portability of a supercontinuum laser are all required. Here, we demonstrate experimentally that launching intense ultra-short pulses with a central wavelength of either 4.5 μm or 6.3 μm into short pieces of ultra-high numerical-aperture step-index chalcogenide glass optical fibre generates a mid-infrared supercontinuum spanning 1.5 μm to 11.7 μm and 1.4 μm to 13.3 μm, respectively. This is the first experimental demonstration to truly reveal the potential of fibres to emit across the mid-infrared molecular ‘fingerprint region’, which is of key importance for applications such as early cancer diagnostics3, gas sensing and food quality control.
    Original languageEnglish
    JournalNature Photonics
    Volume8
    Pages (from-to)830–834
    ISSN1749-4885
    DOIs
    Publication statusPublished - 2014

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