Abstract:
In exciting water possessing an enhanced optical strength by the radiation of a YAG : Nd3+ laser with 20-ps pulses, nonlinear scattering of light was detected in the frequency range of the optical second harmonic. A relationship was established of the signal of the nonlinear scattering with a stimulated Raman scattering (SRS) of the laser radiation in water. Near the SRS threshold, the structure was observed in the spectrum of nonlinear scattering, which is related to intermolecular libration vibrations of water molecules.
Keywords:water structure, parametrical interaction in liquids, active spectroscopy of coherent light scattering, optical strength of water.