Abstract

Experimental and theoretical investigations of multiphonon absorption in semiconducting solids are conducted. We find that structure persists at lower absorption levels (~10⁻² cm⁻¹) and at high temperatures (up to ~550 K) in these materials, in agreement with theoretical predictions. The theoretical analysis indicates that the observed rate of decrease of the absorption with increasing frequency is consistent with available models for the interionic potential and electric moments in these materials. Moreover, the structure in the spectrum is found to be almost exclusively a result of density of states effects, as opposed to k-selection rules.

© 1977 Optical Society of America

Residual absorption in infrared materials

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