X-Ray Optics and Instrumentation

Review Article

Diffractive X-Ray Telescopes

Table 1

Comparison of the efficiency of ideal zone plates (ZPs), phase zone plates (PZPs), and phase Fresnel lenses (PFLs).
Efficiency (primary focus) 𝑛 = 1 Lost to absorption Undiffracted 𝑛 = 0 Secondary foci 𝑛 = − 1 , ± 3 , ± 5 ⋯
ZP 1 / 𝜋 2 = 10.1% 50% 25% 14.9%
PZP 4 / 𝜋 2 = 40.5% 0 0 59.5%
PFL 100% 0 0 0