Fig. 4: Dynamical changes of transient complex refractive index in argon.
a, b Decay profiles of the imaginary and real part of the relative complex refractive index changes at the 3s-4p transition, c, d those at the 3s-5p transition with τDAPs = 5fs and τDAPs = 10 fs. The red and blue symbols and lines correspond to\(\,\triangle \kappa\) and \(\triangle n\), respectively. Each dot represents the measured data, while each solid line shows a best-fit with a double exponential decay convolved with a pulse having a width of 6.5 fs. The decay time \(\tau\) was estimated as a global fitting variable for \(\triangle \kappa\) and \(\triangle n\).
