Increasing demands for highly accurate cylinders require more high-precision testing techniques. The existing
methods of testing cylindrical surfaces can not ensure the highly-accuracy, efficiency, convenience and the overall cost.
In order to acquire highly accurate cylindrical surfaces conveniently at a low cost, a new Fizeau interferometric optical
testing utilizing CGH which is fabricated onto a wedge-shaped substrate is designed. In this test, a slit filter is placed in
the center of the cylindrical curvature to filter out the undesired diffraction orders which occur when the beam hits the
CGH. Meanwhile, the front side of the wedge-shaped substrate is as the reference flat, and the CGH is written onto the
inclined surface, so that the real fringe pattern can not be affected by its reflected beam. Moreover, the design of
cylindrical surfaces under test tilting and off-center relative to the diffraction surface of the CGH results that the required
rays for interference can be obtained effectively from the pinhole filter in the interferometer. Furthermore, high-accuracy
CGH in this test can be processed by conventional microlithography equipments. Corresponding to a cylindrical surface
with 60mm in diameter and f-number of 1/7, the test has been successfully designed and optimized in Zemax whose
testing accuracy is prior to 0.0019λ. Better interference pattern can be obtained because all the other disturbing rays
image outside of aperture in a radius of 2mm. Experiment shows the method is efficient and predominant.