Abstract

Increasing accuracy requirements in aspheric metrology make the development of absolute testing procedures for aspheric surfaces important. One strategy is transferring the standard practice three-position test for spheres to aspherics. The three-position test, however, involves a cat’s eye position and therefore has certain drawbacks. We propose an absolute testing method for rotationally symmetric aspherics where the cat’s eye position is replaced with a radially sheared position. Together with rotational movements of the specimen, the surface deviations can be obtained in an absolute manner. To demonstrate the validity of the procedure, we present a measurement result for a sphere and compare it with a result obtained by the standard three-position test.

© 2009 Optical Society of America

Design considerations for the absolute testing approach of aspherics using combined diffractive optical elements

Gufran S. Khan, Klaus Mantel, Irina Harder, Norbert Lindlein, and Johannes Schwider
Appl. Opt. 46(28) 7040-7048 (2007)

Quasi-absolute interferometric testing of cylinders

Shanyong Chen, Yifan Dai, Dede Zhai, and Yupeng Xiong
Opt. Lett. 47(9) 2278-2281 (2022)

Absolute interferometric test of aspheres by use of twin computer-generated holograms

Stephan Reichelt, Christof Pruss, and Hans J. Tiziani
Appl. Opt. 42(22) 4468-4479 (2003)

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

Frank Simon, Gufran Khan, Klaus Mantel, Norbert Lindlein, and Johannes Schwider
Appl. Opt. 45(34) 8606-8612 (2006)

Dual-wave-front computer-generated holograms for quasi-absolute testing of aspherics

Mathias Beyerlein, Norbert Lindlein, and Johannes Schwider
Appl. Opt. 41(13) 2440-2447 (2002)