Absolute measurement of non-comatic aspheric surface errors.

An absolute test for rotationally symmetric aspheric surfaces was developed. All non-rotationally symmetric surface errors apart from those of comatic nature were determined interferometrically. For this purpose, the asphere was measured 12 times under different angles of rotation. The difference of a single interferogram and the average of all 12 interferograms gave the non-rotationally symmetric errors in an absolute manner apart from the comatic errors. With the purpose of noise reduction, the so-determined 12 interferograms of the non-rotationally symmetric errors were appropriately rotated and subsequently averaged. The rotationally symmetric errors were detected via stylus profilometry. Repeatabilities of the so-obtained aspheric surface errors are presented.

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