1. Calibration of a non-null test interferometer for the measurement of aspheres and free-form surfaces
- Author
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Jens Siepmann, Christof Pruss, Goran Baer, Johannes Schindler, and Wolfgang Osten
- Subjects
Surface (mathematics) ,Physics ,Interferometry ,Optics ,Null (radio) ,business.industry ,Astrophysics::Instrumentation and Methods for Astrophysics ,Calibration ,Free form ,business ,Atomic and Molecular Physics, and Optics ,Compensation (engineering) - Abstract
The measurement of aspheric and free-form surfaces in a non-null test configuration has the advantage that no compensation optics is required. However, if a surface is measured in a non-null test configuration, retrace errors are introduced to the measurement. We describe a method to calibrate the test space of an interferometer, enabling to compensate retrace errors. The method is effective even for strong deviations from null test configuration up to several 100 waves, enabling the fast and flexible measurement of aspheres and free-form surfaces. In this paper we present the application of the method to the calibration of the Tilted Wave Interferometer. Furthermore, the method can be generalized to the calibration of other setups.
- Published
- 2014
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