Fig. 3: Deterministic frequency up- and down-conversion.
a Fluence dependence of the time-resolved rotation of the polarization in the presence of an external field amounting to 200 mT. The solid lines represent the corresponding fits by using Eq. S1. b Precession angle and oscillation frequency extracted from a time-domain fit of the data in (a). c Fluence dependence of the time-resolved rotation of the polarization in the presence of an external field amounting to 60 mT. The solid lines represent the corresponding fits by using Eq. S1. As noted in the text, for the high-fluence regime (i.e., above 2 mJ/cm2) the lifetime of the oscillations is strongly suppressed. This fact forbids a successful fit to the data with a harmonic oscillating function (see Eq. S1). We thus rely on the Fourier transform to extract the amplitude and frequency of the oscillating component of the signal. d Precession angle and oscillation frequency extracted from the data in (c).
