Although two-photon absorption in a semiconductor is typically a very weak effect, the rate of absorption increases dramatically when the two photons have very dissimilar wavelengths, enabling applications such as ultrafast optical sampling and room-temperature mid-infrared detection.
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Murphy, T. Exploiting disparity. Nature Photon 5, 515–516 (2011). https://doi.org/10.1038/nphoton.2011.202
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DOI: https://doi.org/10.1038/nphoton.2011.202
