GENERAL GLASSES OF DOUBLE-PHASE CONJUGATION

The double phase-conjugate mirror (DPCM) is a stimulated four-wave mix ing effect, mediated by either a chi(3) mechanism or a photorefractive effect. The type of grafting that operates in the DPCM can be a trans mission or reflection grating, depending on the wave-mixing configurat ion. Any combination of nonlinearity and grating geometry is possible, so that four general DPCM classes emerge. An analytic solution of the last unsolved class, the photorefractive reflection DPCM, is presente d. With these results, general observations concerning the four catego ries of double phase conjugation are made. An important conclusion is that the type of grating geometry and its associated boundary conditio ns dictate many of the basic features of the DPCM, regardless of the n onlinearity involved.