Quasi-absolute measurement of aspheres with a combined diffractive optical element as reference.
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.
Simon
Frank
F
Institute of Optics, Information and Photonics, Max-Planck Research Group, University of Erlangen Nürnberg, Erlangen, Germany. fsimon@optik.uni-erlangen.de
Khan
Gufran
G
Mantel
Klaus
K
Lindlein
Norbert
N
Schwider
Johannes
J