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The observation and a study of an anisotropy is reported of the photon drag hole current induced by linearly polarized CO, laser light in p-Ge and p-InSb, which is due to the nonspherical structure of the isoenergetic surfaces in the valence band. Besides the drag current longitudinal with respect to the photon momentum, a transverse current component appears in cases where the direction of light propagation is not along the [loo] axis. The transverse current is an oscillatory function of the angle between the electric field vector and the orientation of the transverse contacts. The magnitude of longitudinal current and its polarity reversal temperature in p-Ge depend to a considerable extent on the crystallographic orientation of the samples with respect t o the photon momentum. The experimental data are in agreement with the theory.

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