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 ƒ/0.68 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
DIFFRACTIVE OPTICS AND MICRO-OPTICS
Jean-Michel Asfour and Alexander G. Poleshchuk, "Asphere testing with a Fizeau interferometer based on a combined computer-generated hologram," J. Opt. Soc. Am. A 23, 172-178 (2006)