Researchers have demonstrated high-harmonic generation using strong terahertz pulses in a bulk solid without damaging it. The mechanism underpinning such an extreme nonlinearity also generates coherent electromagnetic radiation covering the terahertz, infrared and optical regions.
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Kim, K., You, Y. Terahertz-driven harmonics. Nature Photon 8, 92–94 (2014). https://doi.org/10.1038/nphoton.2014.6
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DOI: https://doi.org/10.1038/nphoton.2014.6
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