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. 2015 Mar 6;6:6465. doi: 10.1038/ncomms7465

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(a) Spatiotemporal electric field of an isolated attosecond pulse. The instantaneous frequency and the field modulus are depicted. (b) Corresponding two-dimensional (2D) spatial profile of the beam (inset: spatial profile integrated angularly). (c) Spectrogram obtained from the pulse in a. (d) Original and retrieved Wigner functions of the attosecond pulse. (e) Instantaneous frequency and modulus of the five most intense coherent states in the mixture.