Time—resolved picosecond photon echo studies on phase relaxation in CdSSe mixed crystals
U. Siegner, Gert Noll, Serhiy G. Shevel +1 more
Phase relaxation of optical excitations in condensed matter can be studied by coherent four—wave—mixing experiments in the time domain without requiring assumptions on the spectral properties of the material. For inhomogeneously broadened transitions, three laser pulses at times t = 0, t = t21 and t = T with wave vectors k1, k2 and k3, respectively, generate a stimulated photon echo pulse, emitted time—delayed at t = T+t21 in the momentum—matching direction according to k3+k2−k1. As a function of t21 the echo amplitude decays due to scattering events, described by the dephasing time constant T2 [1].
International Conference on Ultrafast Phenomena•Jan 1, 1990•0 citations