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- W2203881978 abstract "Aspherical optical elements with high accuracy are important in several fields such as third-generation synchrotronradiation and extreme-ultraviolet lithography. Then the demand of measurement method for aspherical or free-form surfacewith nanometer resolution is rising. Our purpose is to develop a non-contact profiler to measure free-form surfaces directlywith repeatability of figure error of less than 1 nm PV. To achieve this purpose we have developed three-dimensionalNanoprofiler which traces normal vectors of sample surface. The measurement principle is based on the straightness ofLASER light and the accuracy of a rotational goniometer. This machine consists of four rotational stages, one translationalstage and optical head which has the quadrant photodiode (QPD) and LASER head at optically equal position. In thismeasurement method, we conform the incident light beam to reflect the beam by controlling five stages and determine thenormal vectors and the coordinates of the surface from signal of goniometers, translational stage and QPD. We can obtainthree-dimensional figure from the normal vectors and the coordinates by a reconstruction algorithm. To evaluateperformance of this machine we measure a concave aspherical mirror ten times. From ten results we calculate measurementrepeatability, and we evaluate measurement uncertainty to compare the result with that measured by an interferometer. Inconsequence, the repeatability of measurement was 2.90 nm (σ) and the difference between the two profiles was ±20 nm.We conclude that the two profiles was correspondent considering systematic errors of each machine." @default.
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- W2203881978 date "2015-09-28" @default.
- W2203881978 modified "2023-09-23" @default.
- W2203881978 title "The measurement of an aspherical mirror by three-dimensional nanoprofiler" @default.
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- W2203881978 doi "https://doi.org/10.1117/12.2191040" @default.
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