Phase conjugation through two-photon resonant nondegenerate four-wave mixing

M. T. de Araújo, S. S. Vianna, G. Grynberg

A. I. Erokhin, Vladimir R. Mironenko, Vladimir I. Yudson

S. Karpuk, O. G. Romanov, Alexander S. Rubanov +1 more

The possibility of phase conjugation with simultaneous doubling of the light-wave phase and frequency upon nondegenerate four-wave mixing has been suggested and substantiated theoretically. The dependence of the energy efficiency of double-phase conjugation on the spectroscopic characteristics of the multilevel resonant media has been analyzed.

Henk F. Arnoldus, Thomas F. George

R. L. Abrams, Jenny Lam, Richard C. Lind +2 more

Barbara A. Capron, Murray Sargent

Our semiclassical theory of two-photon multiwave mixing1 is a generalization of the degenerate four-wave mixing case2 to treat nondegenerate pump/signal/conjugate frequencies. We apply that theory to four-wave mixing in two-photon media. We present explicit formulas for the nondegenerate signal/conjugate absorption and coupling coefficients for cases for which the two-photon Stark shifts are sufficiently small compared to the homogeneous linewidths. More general cases require that the spatial hole burning averages be performed numerically. We find intricate dependencies of the transmission and reflection spectra on the pump intensity and on dynamic Stark shifts. In particular, the reflection coefficients do not necessarily bleach to zero as the pump intensity is increased indefinitely, and interferences occur between pure index and mixed absorption/index contributions