Mechanically manipulating the lateral size of the lasing mode of a single-mode terahertz quantum cascade laser provides a new and robust method for widely and continuously tuning its emission wavelength.
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Gmachl, C. A wrench of wavelength. Nature Photon 3, 683–684 (2009). https://doi.org/10.1038/nphoton.2009.227
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DOI: https://doi.org/10.1038/nphoton.2009.227