Abstract

In the four-wave mixing scheme for phase conjugation, the pumps interfere in a nonlinear two-level medium Inducing spatial holes in the population difference. Since these holes are out of phase with the signal and conjugate waves, the projection of the induced polarization onto the waves requires averaging over the pump spatial holes. In their initial treatment of this problem, Abrams and Lind¹ supposed that the squared sinusoids representing the holes in the population denominators could be approximated by_1/2. Later they carried out a more realistic average by integrating the polarization over a wavelength.

© 1986 Optical Society of America