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VOLUME 38 (1983) | ISSUE 1 | PAGE 3
On the nonlinear absorption of light in ZnO single crystals
A study is made of the intrinsic two-photon absorption processes in semiconducting ZnO crystals. It is shown that the nonlinear absorption spectra of these crystals are shaped not only by two-photon absorption but also by two-step impurity absorption. The earlier suggestion of several authors that the two-photon absorption processes are affected by deep-lying valence states is not borne out.