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Appl Opt. 2006 Dec 1;45(34):8606-12.

Quasi-absolute measurement of aspheres with a combined diffractive optical element as reference.

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Institute of Optics, Information and Photonics, Max-Planck Research Group, University of Erlangen N├╝rnberg, Erlangen, Germany.


We have already reported a method for the quasi-absolute test of rotationally symmetric aspheres by means of combined diffractive optical elements (combo-DOEs). The combo-DOEs carry the information for the ideal shape of an aspheric surface under test as well as a spherical wave for the measurement at the cat's eye position. An experimental demonstration of the procedure is given. Measurements with two different designs of combo-DOEs have been conducted, and their relative advantages and disadvantages are discussed.

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