Polarization Properties in Phase Conjugation with Bacteriorhodopsin

Polarization properties of the phase conjugate beam in biological photochrome bacteriorhodopsin with photoinduced anisotropic nonlinearity are studied. We derived the polarization state and reflectivity of the phase conjugate beam in degenerate four-wave mixing (DFWM) where two pump beams have the same or orthogonal polarization and a probe beam has arbitrary polarization. Theoretical results are proved by experiments.