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.
References in periodicals archive ?
At the core of EXES is an approximately 3-foot (1 meter) bar of aluminum called an echelon grating, carefully machined to act as 130 separate mirrors that split light from the telescope into an infrared "rainbow.