The direct generation of femtosecond pulses from an 8-μm quantum cascade laser could prove transformative for sensing and spectroscopy.
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Dhillon, S. Mid-infrared ultrashort pulse generation. Nat. Photon. 15, 869–870 (2021). https://doi.org/10.1038/s41566-021-00919-3
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DOI: https://doi.org/10.1038/s41566-021-00919-3