A new type of lateral shear holographic interferometer is described. It can be used to test lenses as well as spherical and aspherical surfaces. A null pattern with straight fringes can be obtained for an aspherical surface, provided one has a prototype that can be used for making the hologram.
D. Malacara and S. Mallick, "Holographic lateral shear interferometer," Appl. Opt. 15, 2695-2697 (1976)