After almost 50 years of laser research, efficient and compact laser sources operating in the mid-infrared region from 2 μm to 5 μm are still lacking. Now, cascaded silicon Raman lasers look set to provide a convenient answer.
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Thienpont, H. Silicon cascade. Nature Photon 2, 132–133 (2008). https://doi.org/10.1038/nphoton.2008.11
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DOI: https://doi.org/10.1038/nphoton.2008.11