Integration of full-spectrum metrology and polishing for rapid production of large aspheres Project

Metadata Updated: July 8, 2015

Integration of three proven, non-contact, optical metrology techniques with an emerging new polishing approach in a single machine will enable the rapid production of large aspheric mirrors with nanometer-class overall accuracy, excellent smoothness, and nearly arbitrary radius of curvature (concave or convex) and aspheric form.

Two of the metrology approaches are a multi-point profilometer that we have previously demonstrated to have nanometer-level accuracy for low spatial frequencies; and a curvature-measuring profilometer that we have previously demonstrated to have 0.1-nanometer-level accuracy for mid-spatial frequencies. In addition, we propose the simple addition of a scatterometry-based measurement head for high spatial frequencies. The baseline polishing approach is fluid jet polishing, which has been shown to be capable of both fine grinding and polishing. A new understanding of the synergism of these metrology techniques with ductile polishing promises to take in situ metrology and optical fabrication to a major new level.

NASA is continually pushing the frontier in astronomical and earth-observing optical systems. Many of these systems, whether they operate in the x-ray (at normal incidence), ultraviolet, visible, or infrared, have the meter-class (and beyond) optics that would greatly benefit from this technology.

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Public: This dataset is intended for public access and use. License: U.S. Government Work

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Metadata Created Date April 9, 2015
Metadata Updated Date July 8, 2015

Metadata Source

Harvested from NASA Data.json

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Resource Type Dataset
Metadata Created Date April 9, 2015
Metadata Updated Date July 8, 2015
Publisher Space Technology Mission Directorate
Unique Identifier TECHPORT_4994
Paul Glenn
Maintainer Email
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Public Access Level public
Bureau Code 026:00
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Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2004-01-01T00:00:00Z
Homepage URL
Language en-US
Data Last Modified 2015-03-12
Program Code 026:027
Publisher Hierarchy National Aeronautics and Space Administration > Space Technology Mission Directorate
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Source Hash 62da66e278ac20b0d5cc5a5968b9a43ba0968264
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Temporal 2004-01-01T00:00:00Z/2004-07-01T00:00:00Z

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