Fig. 14.2. Spectrum line curvature in spectrometer focal plane with radius of curvature p. See Eq.
(14.1.10).
this curvature is superposed on any curvature of the astigmatic image. The reader
can consult the reference by Welford (1965) for details on this combination.
It is also important to note that curvature and tilt are larger for an echelle than
for a typical grating of small blaze angle, in direct proportion to the angular
dispersion. This factor is an important one to take into account in the design of
any spectrometer, but especially so for an echelle instrument.
14.2.
GRATING ABERRATIONS
The
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