echelon grating

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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.

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