Abstract
Deep levels in a II–VI compound are investigated using a resonant non-degenerate four-photon mixing method, at a low sample temperature. Experimental evidence of deep levels in an undoped CdS is obtained. Amplitude as well as polarization dispersion of the coherent signal output is studied by scanning the 2ωd —ω2 frequency near the midgap resonances at 13700, 15480 and 15700 cm−1. Measurement of impurity content in the crystal is discussed.
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