Shearing Interferometry by Wavefront Reconstruction

Lately, practical applications for holographic techniques have been found in interferometry. These techniques are usefully applied to shearing interferometry. Different kinds of shear are treated, and in several cases the optical system is significantly simplified, compared to the corresponding conventional setups. Both zero-order (no tilt) and multiple-fringe (tilt between wavefronts) interferograms can he achieved, as well as a simple method for displaying the second derivative of phase variation in an object. Experimental results of holographic shearing interferometry are shown.