Research Article

Far-field Diffraction Properties of Annular Walsh Filters

Figure 4

Far-field amplitude distributions for annular Walsh filters on an annular aperture with central obscuration for orders (a) , (b) , (c) , and (d) . The red graph in (a) represents amplitude distribution for an unobscured uniform aperture.
360450.fig.004a
(a)
360450.fig.004b
(b)
360450.fig.004c
(c)
360450.fig.004d
(d)