Abstract
A novel method for determination of real and imaginary parts of a third-order nonlinear susceptibility tensor in a single measurement is proposed and demonstrated. The method measures directly the ratio of imaginary to real part of the [Formula: see text] coefficient in isotropic media. Its sensitivity is high enough to enable measurements with unamplified pulses from a mode-locked Ti:Sapphire laser. Results of measurements for CS 2, 1-Chlornaphtalene and polycrystalline ZnSe are presented.
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