Fig. 4: Calculated dependence of the spectrogram on the duration of VUV attosecond pulse train. | Nature Communications

Fig. 4: Calculated dependence of the spectrogram on the duration of VUV attosecond pulse train.

From: Attosecond metrology of vacuum-ultraviolet high-order harmonics generated in semiconductors via laser-dressed photoionization of alkali metals

Fig. 4

a–c Spectrograms (contour plots), the corresponding frequencies obtained by the Fourier transform along the delay axis of the spectrogram (middle panels), for a single attosecond pulse (a), a long VUV attosecond pulse (b) and an 8 fs long VUV attosecond pulse train (c) (right panels). The latter corresponds to the case, which is closer to the experimental measurements. The insets show the spectrum of the corresponding VUV pulse.

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