Abstract
Fizeau interferometers with an additional diffractive optical element are frequently used for measuring spherical and aspherical surfaces. We present a new (to our knowledge) optical test method, in which the Fizeau principle is now perfectly fulfilled by generating reference and measuring wavefront on the last optical surface, which carries a diffractive optical element. This method has been examined experimentally by testing a reference spherical mirror and can be applied identically for testing aspheres. Several advantages of this method are discussed and proved experimentally.
© 2006 Optical Society of America
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