sensitive function of groove shape and number of grooves/mm. As pointed out by
Loewen and Popov (1997), a disadvantage of the surface holographic grating is
that its groove shape cannot be easily controlled.
Although these gratings are competitive with ruled gratings when used in first
order, they have not been made at the groove densities characteristic of echelles.
First-order gratings are typically used at spectral resolutions of
1E3
to 1E4, and in
this range either type of grating can be used. For high resolution in the range 3E4
to 1E5, the echelle is clearly superior for broad spectral coverage
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