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) | Lost to absorption | Undiffracted | Secondary foci |
| ZP | 10.1% | 50% | 25% | 14.9% | PZP | 40.5% | 0 | 0 | 59.5% | PFL | 100% | 0 | 0 | 0 |
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