Phase conjugation in saturable amplifiers by degenerate frequency mixing

Phase conjugation in staurable amplifiers by degenerate frequency mixing (DFM) is analyzed using numerical solutions for the appropriate equations. DFM reflectivities up to 10
⁴
are predicted with pump intensities considerably less than the saturation intensity. The results are compared to those for saturable absorbers. Effects of spontaneous emission in the amplifiers are also considered.