Figure 6: Calculated kinetics of -DLSS signals in the spectral area of impurity bleaching () for different levels of modulation ; for the cases: without (a) and with account (b) of the coherent TPA contribution. (a) (12) for a Gaussian laser pulse (19) with ns (dotted line, integrated envelope ). Inset-corresponding LID with the numbered points for which the shown same numbered kinetics were calculated ( MW/cm^{2}). Parameters: cm^{−3}, = = = 10^{−17} cm^{2}, = 10^{−5} s, = 10^{21} s^{−1}. (b) Similar calculations, but with adding the contribution of an opposite TPA signal ( = 0,01 cm/MW).