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Concave Diffraction Grating

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Concave Diffraction Grating

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A concave reflection grating can be modeled as a concave mirror that disperses; it can be thought to reflect and focus light by virtue of its con-cavity, and to disperse light by virtue of its groove pattern. The groove pattern can also contribute to focusing for an aberration-reduced concave grating.Since their invention by Henry Rowland over one hundred years ago, concave Diffraction Grating have played an important role in spectrometry. Compared with plane gratings, they offer one important advantage: they provide the focusing (imaging) properties to the grating that otherwise must be supplied by separate optical elements. For spectroscopy below 110 nm, for which the reflectivity of available mirror coatings is low, concave gratings allow for systems free from focusing mirrors that would reduce throughput two or more orders of magnitude.

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