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You searched on: Author: ulf griesmann

Displaying records 11 to 20 of 52 records.
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11. Plasma Etching Uniformity Control for Making Large and Thick Dual-Focus Zone Plates
Published: 1/11/2011
Authors: Lei Chen, Quandou (Quandou) Wang, Ulf Griesmann
Abstract: In summary, an optimized plasma etching process has been developed and a Teflon ring has been made to minimize the feature size variation effect and eliminate the thick glass edge effect. Large phase type dual-focus zone plate with good etching profi ...

12. Spatially resolved height response of phase-shifting interferometers measured using a patterned mirror with varying spatial frequency
Published: 9/1/2010
Authors: JiYoung Chu, Quandou (Quandou) Wang, John Lehan, Ulf Griesmann
Abstract: In the performance evaluation of phase-shifting interferometers for figure metrology, the height response, or height transfer function, is rarely taken into consideration, because in most applications smooth surfaces are measured and only the lowest ...

13. Flatness measurements of thin, plane-parallel optics floated on a heavy liquid
Published: 6/23/2010
Authors: Ulf Griesmann, Quandou (Quandou) Wang, Eric C Benck, Jiyoung Chu, Jaewoong Sohn
Abstract: no abstract

14. A Toolbox for Designing and Analyzing Phase-Shifting Interferometry Algorithms with Characteristic Polynomials
Published: 6/13/2010
Author: Ulf Griesmann
Abstract: Many of the recent advances in understanding of phase-shifting algorithms have yet to be incorporated into the software for commercial phase shifting interferometers. A toolbox, for the open-source computer algebra system Maxima, simplifies analysis ...

15. Power Spectral Density: Is it right?
Published: 6/13/2010
Authors: Ulf Griesmann, John Lehan, Jiyoung Chu
Abstract: We concentrate on the instrumental issues surrounding power spectral density (PSD) determination, using as an example, the most common optical shop QA tool, the Fizeau interferometer. We briefly discuss the properties of an ideal calibration method ...

16. Deformation-Free Form Error Measurements of Thin, Plane-Parallel Optics Floated on a Heavy Liquid
Published: 4/1/2010
Authors: JiYoung Chu, Ulf Griesmann, Quandou (Quandou) Wang, Johannes A Soons, Eric C Benck
Abstract: We describe a novel method for measuring the unconstrained flatness error of thin, plane parallel precision optics by floating them on high-density aqueous metatungstate solutions while measuring the flatness error with an interferometer. The supp ...

17. Computer-Generated Hologram Cavity Interferometry Test for Large X-Ray Mandrels: Design
Published: 6/1/2009
Authors: Guangjun Gao, John P. Lehan, William W. Zhang, Ulf Griesmann, Johannes A Soons
Abstract: A glancing incidence interferometric test for large x-ray mirror mandrels, using two computer generated holograms (CGH s), is described. The two CGH s are used to form a double pass glancing incidence system. One layout of the CGH-cavity glancing in ...

18. Radius Measurement of Spherical Surfaces With Large Radii-of-Curvature Using Dual-Focus Zone Plates
Published: 10/20/2008
Authors: Quandou (Quandou) Wang, Guangjun Gao, Ulf Griesmann
Abstract: The measurement of spherical surface radii exceeding a few meters presents a challenge, because the familiar radius-bench method requires large part displacements. Dual-focus zone plates can extend the radius-bench method to measurements of large rad ...

19. Measuring the Phase Transfer Function of a Phase-Shifting Interferometer
Published: 8/13/2008
Authors: JiYoung Chu, Quandou (Quandou) Wang, John P. Lehan, Ulf Griesmann, Guangjun Gao
Abstract: In characterizing the performance of a phase-shifting interferometer, the dependence of the measured height on the spatial frequency is rarely considered. We describe a test mirror with a special height relief that can be used to measure the height t ...

20. Stationary and non-stationary deformations in three-flat tests
Published: 7/7/2008
Authors: Ulf Griesmann, Quandou (Quandou) Wang, Nicolas Laurenchet, Johannes A Soons
Abstract: Calibration procedures for optical reference flats of phase-shifting interferometers (three-flat tests) are critically important if flatness measurements with low uncertainty are desired. In these tests, all combinations of three flats with unknown f ...

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