A new asynchronous coherent optical sampling method allows for the direct visualization of actively mode-locked quantum cascade laser pulses at terahertz wavelengths.
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Paiella, R. Going ultrafast. Nature Photon 5, 253–255 (2011). https://doi.org/10.1038/nphoton.2011.73
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DOI: https://doi.org/10.1038/nphoton.2011.73