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. 2015 May 20;6:7178. doi: 10.1038/ncomms8178

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(a) The HHG power spectrum of Cs driven by an intense 3,600-nm (mid-infrared) laser pulse with the peak intensity I=1.4 × 10¹²W cm⁻². The black vertical dashed line indicates the corresponding ionization threshold marked by I_p. The dφ/dω denotes the emission time associated a group of harmonics with the central frequency ω, where φ(ω) is the spectral phase of the HHG. (b) A time-domain superposition of the harmonics 7–13. Note that the maximum burst has a duration of about 4.3 fs.