Abstract
Optical phase conjugation by stimulated Brillouin scattering, excited by an inhomogeneous light field with a self-focusing strong component, has been investigated. The conjugation fraction \ensuremath{\eta} depends on the intensity ratio \ensuremath{\sigma} of the strong component to the total pump light, attaining a maximum at a certain value of \ensuremath{\sigma}. Theoretical analysis shows that a four-wave-mixing process is involved in its physical mechanism. By taking into account the effect of self-focusing, a fair agreement with experiments is obtained.
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