The second- and third-order hyperpolarizabilities of various mono- and meta-disubstituted benzene derivatives have been measured in the liquid state by simultaneous use of static-field induced second-harmonic generation and tunable four-wave mixing. For the vector part of the second-order optical nonlinearity comparison is made between liquid-state and solid-state experimental data.

A new method of nonlinear spectroscopy aiming to probe solids in the highly dispersive and absorbing region is presented. It requires only one laser and uses wave-vector rather than frequency discrimination of the nonlinear signal from the input beams. Application is made to the study of the T x biexciton level in CuCl.

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