Abstract

A simple three-aperture speckle shearing arrangement is proposed for simultaneous measurement of slope and curvature of the specimen. The double exposed shearogram of the laser-illuminated specimen yields five distinct diffraction halos when subjected to Fourier filtering. The first-order halos on either side of the central halo give slope fringes of the specimen, together with relatively broad low-visibility curvature fringes. The second-order halos provide pure slope fringes with a sensitivity double that of the slope fringes obtained from the first-order halo.

© 1984 Optical Society of America

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