Fig. 2: Concept of the unbalanced-intensity nonlinear IAC for n = 2.
From: Complete characterization of ultrafast optical fields by phase-preserving nonlinear autocorrelation
a Flow chart of the (mixed) field powers contributing to the different cross-correlation components which constitute the IAC signal in the time domain according to Eq. (1) with harmonic indices as introduced in Eq. (2). The star operator denotes cross-correlation: \(\left( {f \star g} \right)\left( \tau \right) = {\int} {\overline {f\left( {t - \tau } \right)} } g\left( t \right)dt\). b Time-domain components of the IAC for n = 2 and s = 0.5 for an exemplary few-cycle pulse (see text) depicting the fundamental and nonlinear field quantities (left panel), the cross-correlation components (middle panel), and the resulting IAC signal (right panel). Only the real parts are shown. c Frequency-domain representation of b according to Eq. (2) showing spectral magnitudes (solid lines) and phases (dotted lines)
