Efficient phase conjugation by Brillouin enhanced four wave mixing

It is shown that frequency detuning and phase mismatch effects can strongly effect the reflection coefficient of Brillouin enhanced four-wave mixing. Extremely large reflectivities (R > 10⁶) can be obtained if the intensities and frequency of the pump beams and the length of the interaction region all take on certain critical values. This theory accounts for the high reflectivity which has been reported by another author.