Ll. Doskolovich et al., ANALYSIS OF QUASI-PERIODIC AND GEOMETRIC OPTICAL SOLUTIONS OF THE PROBLEM OF FOCUSING INTO AN AXIAL SEGMENT, Optik, 101(2), 1995, pp. 37-41
An analytic and an iterative method for calculating novel ''quasiperio
dic'' diffractive optical elements (DOEs) capable to focus the radiati
on into an optical axis segment are developed. A quasiperiodic DOE can
be treated as a set concentric rings with each of them forming the en
tire focusing segment. The executed numerical studies have shown the h
igher efficiency of quasiperiodic DOEs as compared with known focusing
DOEs.