Abstract

The coupled-probe, conjugate, and pump differential equations are solved in the undepleted pump approximation when the pumps are of unequal frequencies. In the usual analysis the two pump wave vectors satisfy k₁ + k₂ = 0, so that the conjugate and probe wave vectors satisfy k_p + k_c = 0. The vector phase matching then consists of two one-dimensional problems. However, the unequal pump frequencies require a true two-dimensional analysis, since the pump wave vectors do not sum to zero separately from the probe/conjugate fields. This then requires the inclusion of a transverse dimension in the differential equations. The net result is that the direction of the maximum conjugate intensity, usually determined by the phase-match condition Δk = 0, is instead determined by the generalized condition k_c · Δk = 0, where Δk = k₁ + k₂ − k_p − k_c. This new phase-matching condition is quadratic in k_c, leading to two peaks in the conjugate reflection coefficient.

© 1987 Optical Society of America

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