Interferometry is a technique for reconstructing the profiles of phase objects. We present a novel interferometric setup for generating interferograms with doubled phase profile and enhanced contrast compared with the standard interferogram. The proposed system consists of a two-beam interferometer in which the reference and test waves are circularly polarized orthogonally to each other. They are superposed upon a bacteriorhodopsin film, creating a polarization grating that is distorted by the phase of the test object. This polarization pattern is read by a polarized He–Ne beam. We show analytically and experimentally that, when the zero diffraction order is removed, an interferogram with doubled phase profile and enhanced contrast is obtained.
© 2003 Optical Society of America
José A. Ferrari, Eugenio Garbusi, and Erna M. Frins, "Enhancing the phase profile and contrast of an interferogram by polarization recording in bacteriorhodopsin," Opt. Lett. 28, 1454-1456 (2003)