We present a general proof of the distortion-correction theorem, that is, of the possibility of correcting wave distortion by the technique of optical phase conjugation. The proof is valid for fully vectorial nonparaxial propagation in the presence of a tensorial refractive-index perturbation and backscattering of the incident field. (C) 2001 Optical Society of America OCIS codes: 190.5040, 260.2110. [References: 6]
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