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Figure 8.3: Properties of Grating Echelle-A
Figure 8.4: Properties of Grating Echelle-B
Echelle Wavelength Formats
The illustrations below provide a means of estimating where particular wavelengths fall within the echelle formats and where they lie relative to the blaze peak. Note that these layouts are purely schematic; the actual length of the free spectral range changes from order to order. The center of each order is at ml = 56200.Figure 8.5: Schematic format of wavelengths for Echelle-B.
Figure 8.6: Schematic format of wavelengths for Echelle-A.
Echelle Blaze Function
The figure below shows the echelle blaze function (also known as the "Ripple Function") in the form of sensitivity relative to the peak of the blaze as the product of wavelength and order number.Figure 8.7: Normalized blaze function for the GHRS echelle gratings.
