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

Figure 4. Free-electron laser pulse measurement in the presence of temporal jitter.

Figure 4

(a) Spectrogram of an FEL pulse dressed by a 20-fs laser pulse without and with temporal jitter between the infrared and XUV pulses. The green shaded area indicates the jitter envelope. Insets represent a zoom in of the area delimited by the dashed line. A two-step procedure is used to retrieve the FEL pulse from the spectrogram in a in the presence of jitter. (b) First, Mixed-FROG is used to retrieve the FEL pulse correlation function C(t, t′). (c) Second, a blind deconvolution is performed to suppress the influence of jitter on C(t, t′). (d) Original (black continuous curve and grey shaded area) and retrieved (coloured dashed lines) XUV pulse, jitter envelope and infrared phase modulator. (e) XUV pulse and infrared gate retrieved through the conventional FROG-CRAB technique.