An echelle grating (from French échelle, meaning "ladder") is a type of characterised by a relatively low groove density, but a groove shape which is optimized for use at high incidence angles and therefore in high. Higher diffraction orders allow for increased dispersion (spacing) of spectral features at the detector, enabling increased differentiation of these features. Echelle gratings ar.
An optical spectrometer (spectrophotometer, spectrograph or spectroscope) is an instrument used to measure properties of over a specific portion of the, typically used in to identify materials. The variable measured is most often the of the light but could also, for instance, be the state. The independent variable is usually the of.
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