Abstract
By measuring, as a function of temperature, the nonlinear light transmittance from neodymium and ruby lasers, the ZnTe two-photon absorption (TPA) has been studied both near the direct band gap and close to the critical point ${E}_{1}$. The TPA absolute coefficients have been determined by means of the two-channel normalization technique. It has been found that for $2\ensuremath{\hbar}\ensuremath{\omega}\ensuremath{\ge}{E}_{g}$, the TPA spectrum line shape has a dependence that is peculiar to absorption involving exciton levels, while for $2\ensuremath{\hbar}\ensuremath{\omega}$ close to ${E}_{1}$, the line shape has a ${(2\ensuremath{\hbar}\ensuremath{\omega}\ensuremath{-}{E}_{g})}^{\frac{3}{2}}$ dependence, which is typical of the "allowed-forbidden" mechanisms corresponding to the two-band model. By comparing the TPA experimental and theoretical values, it has been found that the TPA is strongly influenced both by the exciton effect and by the valence-band degeneracy.
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