Abstract
We report the results of experimental and theoretical studies of the laser-induced birefrigence of concentrated suspensions of shaped, anisotropic artificial Kerr media. The systems we investigate experimentally are aqueous suspensions of polytetrafluoroethylene (PTFE). The observed slowing down of the relaxation of the birefringence signal is in agreement with pretransitional behavior near the isotropic-nematic phase transition. However, in order to explain the relatively small increase of the induced birefringence with an increase in concentration, and the double exponential character of relaxation, one should include the possible deviation of the optical axis from the geometrical, or long, axis of the PTFE particles.
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