echelon grating


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Related to echelon grating: echelle spectrograph, echelette grating

echelon grating

[′esh·ə‚län ‚grād·iŋ]
(spectroscopy)
A diffraction grating which consists of about 20 plane-parallel plates about 1 centimeter thick, cut from one sheet, each plate extending beyond the next by about 1 millimeter, and which has a resolving power on the order of 106.