Abstract

Interferometric tests of aspherics are discussed under three main aspects: (1) the reduction of the sensitivity to measure even steep aspherics, (2) the extended use of diffractive optical elements as phase conjugate members within the interferometer, and (3) the calibration issue which is especially involved with aspherics. In addition rod-type aspherics are included in our discussion because cylindrical and toroidal surfaces become more and more important.

© 1999 Optical Society of America