Abstract
We describe a new shearing interferometer for lens testing which has high precision and direct display of lens aberrations. Shear is obtained by reflecting a wavefront collimated by the lens under test from the front and rear surfaces of a wedged glass plate. The surfaces of the plate are coated to increase their reflection coefficient and give sharp multiple beam interference fringes which are easy to measure and interpret. We show mathematically that the interference fringes map out the lateral aberration curve of the lens under test directly, and present experimental results which display the advantages of this system over conventional two-beam shearing interferometers.
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