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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
13.3.
Echelles 327
Table 13.1
General Equations for Reflection Gratings
mX = o"(sin
P
+ sin a)
dp m sin
j5
+ sin a
A =
dX G cos P X cos p
fr(sin
P
+ sin a)
fr(sin p + sin a)
/I and )1, for which we have m)! {m
-\-
X)X,
The wavelength difference
AA = A'
A
is called the ^^^ spectral range, where
M = ):
-X^XIm.
(13.2.6)
The two wavelengths are diffracted in the same direction and confusion is the
result unless one is rejected by a filter or they are separated with a cross-
disperser. Both techniques are used to eliminate the wavelength overlap, with a
cross-disperser most often used when m is large and a filter when m is small.
13.3.
ECHELLE ...
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Publisher Resources

ISBN: 9780126298109