Third-generation holographic Rowland mounting: fourth-order theory.
1999
The third-generation holographic Rowland mount consists of a
Rowland-mounted, optimally recorded holographic spherical grating,
referred to as an optimized Rowland grating (ORG), whose recording
sources are aberrated by two auxiliary ORG’s. The main purpose of
this mount is to avoid any aspherical surface while providing control
over all the parameters needed to correct the aberrations up to and
including the fourth order. Earlier [Appl. Opt.30, 4019–4025 (1991)], we considered the case of a moderate coma
c2. We now give the fourth-order theory, apply it to the
high-dispersion (4600 grooves/mm) grating considered previously,
and obtain for it diffraction-limited images.
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