Abstract
We study experimentally the radiation from cadmium sulfide monocrystal wafers 0.02–0.25 mm thick grown from gas phase and excited by nanosecond laser pulses. It is shown that along with the luminescence in the visible range, which is related to the exciton–exciton scattering process, terahertz radiation, which can be related to transitions in the exciton band of a crystal, is observed at temperatures 300 K and 77 K. When visible radiation is excited in CdS crystals due to exciton–exciton scattering transitions, the intensity of the observed terahertz radiation rises sharply, which makes it possible to say that population inversion at the exciton levels is possible.
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