Abstract
High resolution polarization rotation spectroscopy is performed to evaluate the third-order nonlinear susceptibility, | χ(3) |, associated with the giant two-photon absorption (GTA) of biexcitons in CuCl. The true width of the biexciton atK ≈ 0 and | χ(3) | at the resonant peak are obtained to be 24 ± 2 μeV and (3.0 ± 0.9) × 10-4 esu at the weakest excitation density of ⩽ 1 kW/cm2 for a high quality crystal, respectively.
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