Fig. 6: Pulse characterization using two-dimensional shearing interferometer (2DSI).
From: Optical parametric amplification of sub-cycle shortwave infrared pulses
a 2DSI spectrogram. The group delay (GD) obtained from the spectrogram is depicted as a solid curve. b Measured spectrum (solid curve) of the output pulse from OPA3 and the spectral phase (dashed line) retrieved from the measured GD in a. The shaded area indicates the standard deviation for the measured spectra. c Temporal profile (intensity) calculated from the measured spectrum and the retrieved phase is shown as a shaded area. The pulse duration is estimated to be 4.3 fs in FWHM, which is comparable to the pulse duration of the transform-limit (TL) pulse, depicted as a dashed curve, with a pulse duration of 4.2 fs. d Electric field calculated from the measured spectrum and the retrieved phase is depicted as a solid curve. We assume the CEP to be zero in this calculation. The shaded area specifies the envelope of the electric field. The electric field of the TL pulse is also shown as a dashed curve for comparison.
