Fig. 3: Field retrieval simulation.
From: Complete characterization of ultrafast optical fields by phase-preserving nonlinear autocorrelation
a Field retrieval of a few-cycle low-dispersion pulse from its IAC for n = 2 and s = 0.5 shown after different iteration steps i in the frequency domain. The left column depicts the reference (dark blue) and retrieved (orange) IAC signals as well as the spectral filter (dashed gray line) used to extract the I1,0 signal and initial field guess from the IAC. The right column shows the reference (red) and retrieved (green) electric fields as well as the reference (purple) and retrieved (blue) gating fields. Magnitudes are shown as solid lines and phases as dotted lines; flat phase segments outside the fundamental peak are not shown. b Retrieval attempt from a balanced IAC (s = 1) shown after convergence for comparison. Only the fundamental peak of the IAC is reproduced due to the lack of spectral phase information, yielding a wrong field result. c Retrieval convergence depicting the error quantities as defined in Eqs. (10–12). The solid lines refer to the s = 0.5 case and the dotted lines to the s = 1 case. The phase error is shown in radians, while the other errors are dimensionless (but are all shown on the same scale)
