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Optical Engineering

Measurement of optical flatness using electronic levels
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Paper Abstract

Conventional measurement methods for large flat mirrors are generally difficult and expensive. In most cases, comparison with a master or a reference flat similar in size is required. Using gravity, as in modern pendulum-type electronic levels, takes advantage of a free reference to precisely measure inclination or surface slopes. We describe using two electronic levels to measure flatness of large mirrors. We provide measurement results on a 1.6-m-diameter flat mirror to an accuracy of 50 nm rms of low-order Zernike aberrations.

Paper Details

Date Published: 1 February 2008
PDF: 9 pages
Opt. Eng. 47(2) 023604 doi: 10.1117/1.2831131
Published in: Optical Engineering Volume 47, Issue 2
Show Author Affiliations
Julius Yellowhair, Sandia National Labs. (United States)
James Howard Burge, College of Optical Sciences/The Univ. of Arizona (United States)

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