Over the last decade refractive lenses for monochromatic X-ray radiation have been realized for many different materials by microfabrication technology. All these lens systems are successfully working only for one discrete energy, i.e. the lenses are chromatic. Thus each discrete energy within a certain energy range has a different focal length. While the focal spot size is smaller than a micron for a particular energy at the corresponding focal distance, it increases up to several tens of microns for a larger energy range. We present results of numerical simulations for a new type of lens system which addresses this problem. We are developing achromats by combining different refractive elements of different materials. Via ray-tracing we determine the parameters of the lenses by minimizing the focal spot size for an energy range of about E ± ΔE with ΔE = 15%. Thus the spot size of an energy range can be noticeably reduced compared with conventional refractive (chromatic) lens systems.

Date Published: 3 September 2008
PDF: 9 pages
Proc. SPIE 7077, Advances in X-Ray/EUV Optics and Components III, 70770G (3 September 2008); doi: 10.1117/12.795222

Published in SPIE Proceedings Vol. 7077:
Advances in X-Ray/EUV Optics and Components III
Ali M. Khounsary; Christian Morawe; Shunji Goto, Editor(s)