4.4 Article Proceedings Paper

The Diamond-NOM: A non-contact profiler capable of characterizing optical figure error with sub-nanometre repeatability

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.nima.2009.10.137

Keywords

Diamond-NOM; Metrology; Optical testing; Pentaprism; Autocollimator; Synchrotron; X-ray optics

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We present design and implementation details of the Diamond-NOM (nanometre optical metrology)-a non-contact profiler capable of measuring the surface topography of large (up to 1500 mm long) and heavy (up to 150 kg) optical assemblies with sub-nanometre resolution and repeatability. These levels of performance are essential to fabricate and optimize next generation optics. The capabilities of the Diamond-NOM have already enabled collaborations with optic manufacturers, including production of a preferentially deposited, large (1.2 m), synchrotron mirror with a slope error of similar to 0.44 mu rad rms and using bimorph technology to reduce figure error of a super-polished (elastic emission machining) optic to <1 nm peak to valley. We demonstrate that the BESSY-NOM scanning pentaprism and autocollimator concept is robust, easily transferable, and repeatable. (C) 2009 Elsevier B.V. All rights reserved.

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