The demonstration that lasing at high-k wavevectors is possible in a quantum cascade laser may open new avenues for the design of intersub-band devices.
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Faist, J. Lasing high in k-space. Nature Photon 3, 11–12 (2009). https://doi.org/10.1038/nphoton.2008.260
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DOI: https://doi.org/10.1038/nphoton.2008.260