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High-harmonic generation

Solid progress

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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Figure 1: Wavelengths and field strengths required for HHG.


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Marangos, J. Solid progress. Nature Phys 7, 97–98 (2011).

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