Nichtstationärer ramaninduzierter Kerreffekt in Flüssigkeiten und einachsigen Piezokristallen

Nonstationary Raman-Induced Kerr Effect in Liquids and Uniaxial Piezocrystals A nonstationary probe-beam method using Raman-induced Kerr effect (RIKE) for measuring the (transversal) relaxation constant Γ (= T) of piezo crystals and Raman active liquids is discussed. In isotropic media, in every scattering geometry phase matching is realised automatically for all frequencies and therefore, in contrast to coherent active Raman spectroscopy (CARS), the complete Raman spectrum is generated simultaneously and also its time behaviour can be studied. (In anisotropic crystals the appearing of RIKE will be drastically reduced.) For arbitrary correlation behaviour of the pump fields the nonstationary signal intensity vanishes exponentially with the effective vibration damping constant and with the delay-time of the testpulse. The dependence of the signal on the characteristic interaction length between the pulses (L_S), on the phase modulation times τ_L,S, and on the probe length L are studied. The analogies between the methods of active Raman spectroscopy (ARS), RIKE, and induced two-photon-emission-experiments will be illustrated.