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échelle grating
A diffraction grating in which the grooves are quite widely spaced and have a zigzag or step-like cross-sectional profile; the name is French for “ladder.” The light to be dispersed is made to fall on the grating at right angles to the faces of the grooves. This has the effect of producing a series of overlapping spectra with a high degree of resolution. A second, low-dispersion grating, or a prism, arranged perpendicular to the échelle, serves to separate out the overlapping spectra.
Related entry
• échelle spectrograph
Related category
• SPECTRA AND SPECTROSCOPY
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