Optical phase conjugation and two-wavelength recording in a photorefra
ctive crystal BaTiO3 is used for real-time lateral-shear interferometr
y. Dispersion in uniaxial BaTiO3 crystal is used to provide perfect ph
ase matching for two gratings of different spatial frequencies. Theore
tical predictions of possible geometries are experimentally verified.
The magnification effect and modulation of diffraction efficiency due
to recording-reconstruction with different wavelengths are also presen
ted.