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Astronomical Optics, 2nd Edition
book

Astronomical Optics, 2nd Edition

by Daniel J. Schroeder
September 1999
Intermediate to advanced content levelIntermediate to advanced
478 pages
21h 54m
English
Academic Press
Content preview from Astronomical Optics, 2nd Edition
396 15. Plane Grating Spectrometers
15.5.f.
CONCLUDING REMARKS
Although our discussion of echelle formats and spectrometer configurations is
given in terms of echelles with tan
5
= 2 or larger, the relations used apply to any
blaze angle. An echellette grating can also be used with a cross disperser to
separate orders. Consider, for example, a grating with 300 grooves/mm and
tan
6
= 0.75. From the grating equation in Table 15.4 we get
m^Q
(^m) = 4 cos 9,
hence most of the visible spectrum is covered in four orders, m = 6 through
m = 9. These orders are easily separated with a crossed prism in the configuration
shown in Fig.
15.11.
Because o ...
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Publisher Resources

ISBN: 9780126298109