Abstract
A microcomputer-aided ellipsometer with a spinning quarter-wave plate and an analyzer was developed for the simultaneous determination of all the Stokes parameters. This system is quite good for measurements of a photo-induced non-linear polarization change, where a low-repetition pulsed laser is used as the light source. We applied this system for measurements of the photo-induced optical activity associated with the two-photon formation of Γ1 excitonic molecules in CuCl. The coherent polarization change of a linearly polarized probe beam due to two-photon dispersion was clearly observed under irradiation by a circularly polarized excitation beam of 0.5 MW/cm2, and a strong depolarization was found near the two-photon resonance. We ascribe the origin of this depolarization to a random modulation caused by an intensity fluctuation in the pump beam.
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