Abstract
Nonlinear absorption spectra of Zn0.37Cd0.63Se crystals were measured using the method of two light sources. At high levels of excitation by neodymium laser pulses, both fundamental two-photon absorption and absorption by excess free carriers are observed. At low excitation, impurity centers with energy levels spaced 0.72, 0.63, 0.53, 0.42, 0.36, 0.25, and 0.20 eV from the edge of the band gap are detected.
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