The time-averaged electric energy density near the focus of a parabolic mirror of wide-angular aperture is calculated and compared with that of an aplanatic lens system. The distributions exhibit great differences, the mirror showing a greater departure from circular symmetry, a more complicated structure and increased sidelobes. The vectorial integral representation of Wolf is derived from the Stratton-Chu formula.
No takes yet. Share an insight, caveat, or question.
Sheppard et al. (1977) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: