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Concave Grating Spectrometer Designs

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Concave Grating Spectrometer Designs

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As with plane grating mounts, concave grating mounts can be used in either monochromators or spectrographs designs.The first concave gratings of spectroscopic quality were ruled by Rowland, who also designing their first mounting. Placing the ideal source point on the Rowland circle (see Eqs. (7-12) and Figure 7-5) forms spectra on that circle free from defocus and primary coma at all wavelengths (i.e., F20 = F30 = 0 for all λ); while spherical aberration is residual and small, astigmatism is usually severe. Originally a Rowland circle spectrograph employed a photographic plate bent along a circular arc on the Rowland circle to record the spectrum in its entirety.

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