ABERRATIONS: COMPARISON WITH SPHERICAL LENSES

Ni mesh x-ray microscopy
Fig. 1. Ni mesh imaged by parabolic x-ray lenses

Figure 1 shows a Nickel mesh with a period of 12.7 μm that is imaged at 12 keV by N=91 beryllium 2D-lenses with R=200 μm and a magnification factor of 10 onto a high resolution film. It is obvious that the image is practically free of aberrations. Figure 2 shows a computer simulation of the imaging of a similar mesh by parabolic lenses (left) and by spherical lenses (right). Note that spherical lenses are inappropriate for imaging with x-rays.

Spherical aberration
Fig. 2. Computer simulation, parabolic (left) and spherical (right) lenses