V2 1 V2

Various (t2/ti, v, b/a) solution sets for a vase-form geometry satisfying (5.22c) are given in Table 5.3.

The uniform load q is applied to the inner part of the vase form and its reaction arises at the contour r = rm = a. For a best validity of this CTD, the junction between the two thicknesses t1 and t2 is realized with a radius of curvature equal to thickness t1 (Fig. 5.11) (see also Fig. 7.9-Up).

Spherical aberration corrections including Sphe 5, Sphe 7 and higher-order terms can be achieved with a variable thickness vase form. The thickness distribution of the clear aperture can be determined similarly as given in Sect. 5.4 for the case of making axisymmetric gratings with k = 3/2. The result is a thickness distribution r m t

0 0

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