Bulk Cd1-xZnxTe ternary compounds are studied through nonlinear optica
l pump and probe experiments for different zinc concentrations x. Thes
e measurements, similar to excitation spectra, enable us to determine
the frequency dependence of the optical nonlinearity. It is attributed
to the presence of impurity levels in the material. The two-photon ab
sorption through these states gives rise to a high induced absorption.
(C) 1997 American Institute of Physics.