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4. Optical assemblies with concave grating
4.1 Concave grating polychromator
Although a large number of optical assemblies have been described using standard gratings, only a small number are actually in use. Polychromators using concave gratings are based on the Paschen-Runge configuration. Concave gratings are used not only for diffraction, but also for collimation. The Paschen-Runge setup uses the Rowland circle, where a spherical concave grating of radius R is located on the perimeter of a circle of diameter equal to R (figure 8 ), with the grating lines perpendicular to the plane of the circle. The advantage of such an arrangement is that, if the entrance slit is located...
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Optical assemblies with concave grating
Reciprocal linear dispersion
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