Figure 9: Schemes of the spectra formation for stationary α(ω) and induced Δα(ω) impurity absorption and the optical transitions, explaining γ-DLSS, as the consequence of laser modulation of the quasistationary TSA by the capture of two-photon generated carriers. (a) and (c). Energy scheme and TSA spectrum α(ω) before the modulation [same as on (b) and (e) parts of Figure 4]. (b) and (d). Energy scheme and TSA spectra changes as a result of laser modulation. (e) Resultant induced absorption spectrum.