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Expressions for the dielectric constant of a pure liquid are obtained from quantum electrodynamics, and compared with those obtained from electrostatic arguments. The Lorentz cavity field is shown to be associated with off-resonance intermolecular exchange of excitation. An application of perturbation theory up to a level including such excitation exchange leads to the Debye equation for pure non-polar liquids, and an analogue of the Onsager equation for polar liquids.

Dynamic grating recording was investigated in doped induced choistericaJ. liquid crystals. The recording time is about some picoseconds, diffractive efficiency is about 10 per nents. Self-diffraction was observed with diferent polarization of input beams (linear or circular). Vector self-diffraction was obtained with diffractive intensity about 2 per cents.