Figure 9
Time evolution of the THz pulse (solid line) at the penetration depth ξ = 10/β in the sample driven by an infrared probe pulse with wave form \({{\rm{\Omega }}}_{p}={{\rm{\Omega }}}_{p}^{0}\,[1-0.5\,\tanh \,\mathrm{[4(}\tau -\mathrm{60)]}+0.5\,\tanh \,\mathrm{[4(}\tau -\mathrm{120)]}\) − 0.5 tanh \(\mathrm{[4(}\tau -\mathrm{180)]}+0.5\,\tanh \,\mathrm{[4(}\tau -\mathrm{240)]]}\) for different \({{\rm{\Omega }}}_{p}^{0}\): (a) \({{\rm{\Omega }}}_{p}^{0}=0.5\gamma \); (b) \({{\rm{\Omega }}}_{p}^{0}=\gamma \). Other parameters are g(ξ = 0, τ) = 1, B = 3 T, γ 31 = γ 32 = γ, γ = 3 × 1013 s −1, γ 21 = 0.05γ, \({{\rm{\Omega }}}_{TH}^{0}=0.005\gamma \), and Δ p = Δ TH = 0, respectively.
