The Goos-Hanchen shift between a supercritically incident beam and its
reflection in a total-internal-reflection mirror comprising a materia
l interface is well established. We experimentally demonstrate that th
e Goos-Hanchen effect can also occur between the probe beam and the ph
ase-conjugate beam in a phase-conjugate mirror. Controlled lateral dis
placements of up to 218 mu m were measured using photorefractive four-
wave mixing with a frequency-detuned Gaussian probe beam.