echelon grating


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Related to echelon grating: echelle spectrograph, echelette grating

echelon grating

n.
A diffraction grating made of parallel glass plates, each of which extends slightly beyond the next, used to examine extremely fine structures through interferometry.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.