The nonlinear optical process of high-order harmonic generation is usually seen in atomic gases. Now, the process has been observed in a bulk crystalline solid, with important implications for ultrafast coherent short-wavelength sources and perhaps attosecond science.
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Marangos, J. Solid progress. Nature Phys 7, 97–98 (2011). https://doi.org/10.1038/nphys1913
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DOI: https://doi.org/10.1038/nphys1913
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