echelle grating

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A diffraction grating with rulings spaced relatively widely (typically 30–100 per millimetre). Because of the small number of rulings, the grating produces numerous overlapping spectra that must be separated before they reach the detector. Echelle gratings are easier to manufacture than gratings with a higher density of rulings, but require a more complex spectrograph design (see Echelle Spectrograph).

Subjects: Astronomy and Astrophysics.

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