TY - JOUR
T1 - Enabling precision coordinate metrology for universal optical testing and alignment applications
AU - Khreishi, Manal
AU - Ohl, Raymond G.
AU - Howard, Joseph M.
AU - Papa, Jonathan C.
AU - McClelland, Ryan
AU - Hovis, Clark
AU - Hadjimichael, Theodore
AU - Thompson, Patrick
AU - Ranson, Kenneth
AU - Liang, Rongguang
AU - Gorius, Nicolas
N1 - Funding Information:
The authors would like to gratefully acknowledge James Jeletic and Maurice Henderson of GSFC and the Hubble Space Telescope project for their support and the loan of the backup secondary mirror. The authors would like to thank Pete Maymon for sharing valuable resources and the loan of CIRS OAP. Special thanks to Steven Phillips from the National Institute of Standards and Technology, Adam Phenis from AMP-Optics, and Christopher Evans from the University of North Carolina at Charleston, for their support and enlightening discussions. Thanks to Greg Wenzel, Kevin Redman, and L’Ralph Optics and Metrology Team. Many thanks to William Zhang and the NGXO Group at GSFC for the unique research opportunity and for supporting this effort. The authors would also like to acknowledge Edgar Canavan for his insightful review of the manuscript and providing valuable feedback. This work was supported by Lucy/L’Ralph Optics Management, the NASA Earth Science Technology Office, and NASA’s GSFC Internal Research and Development Program. The development work of x-ray optics technology has been funded by NASA through the Astronomy and Physics Research and Analysis Program (APRA) and the Strategic Astrophysics Technology Program under the Research Opportunities in Space and Earth Sciences (ROSES) Program. This paper is mostly based on the first author’s Doctor of Philosophy dissertation titled “Ultra-precision non-contact metrology for optical shop testing and alignment applications,” accepted on April 24, 2019, at the College of Optical Sciences of The University of Arizona.
Publisher Copyright:
© 2021 Society of Photo-Optical Instrumentation Engineers (SPIE).
PY - 2021/3/1
Y1 - 2021/3/1
N2 - Optical designs for the next generation space science instruments call for unconventional, aspheric, and freeform (FF), prescriptions with tight tolerances. These advanced surfaces enable superior-performance, compact, and lower cost systems but are more challenging to characterize and, hence, to fabricate and integrate. A method was developed to characterize a wide range of optical surfaces, without requiring custom-made correctors, and to align them to each other for a high-performance optical system. A precision coordinate measuring machine, equipped with a non-contact, chromatic confocal probe, was used to measure numerous optics including large convex conics, high-sloped aspherics, several FF surfaces, and grazing-incidence x-ray optics. The resulting data were successfully reduced using custom-developed, advanced surface fitting analysis tool, to determine the optic's alignment relative to the global and local coordinate systems, surface departure from design, and the as-built optical prescription. This information guided the modeling and the alignment of the corresponding as-built optical systems, including a flight system composed of a three-mirror anastigmat.
AB - Optical designs for the next generation space science instruments call for unconventional, aspheric, and freeform (FF), prescriptions with tight tolerances. These advanced surfaces enable superior-performance, compact, and lower cost systems but are more challenging to characterize and, hence, to fabricate and integrate. A method was developed to characterize a wide range of optical surfaces, without requiring custom-made correctors, and to align them to each other for a high-performance optical system. A precision coordinate measuring machine, equipped with a non-contact, chromatic confocal probe, was used to measure numerous optics including large convex conics, high-sloped aspherics, several FF surfaces, and grazing-incidence x-ray optics. The resulting data were successfully reduced using custom-developed, advanced surface fitting analysis tool, to determine the optic's alignment relative to the global and local coordinate systems, surface departure from design, and the as-built optical prescription. This information guided the modeling and the alignment of the corresponding as-built optical systems, including a flight system composed of a three-mirror anastigmat.
KW - Precitec probe
KW - aspheric
KW - coordinate measuring machine
KW - freeform
KW - grazing incidence
KW - large convex
KW - optical alignment
KW - optical metrology
KW - optical shop testing
KW - universal optical testing
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U2 - 10.1117/1.OE.60.3.035106
DO - 10.1117/1.OE.60.3.035106
M3 - Article
AN - SCOPUS:85104725587
SN - 0091-3286
VL - 60
JO - Optical Engineering
JF - Optical Engineering
IS - 3
M1 - 035106
ER -