Single-bounce ellipsoidal and paraboloidal glass capillary focusing optics have been fabricated for use as condenser lenses for both synchrotron and tabletop x-ray microscopes in the x-ray energy range of 2.5-18 keV. The condenser numerical apertures (NAs) of these devices are designed to match the NA of x-ray zone plate objectives, which gives them a great advantage over zone plate condensers in laboratory microscopes. The fabricated condensers have slope errors as low as 20 μrad rms. These capillaries provide a uniform hollow-cone illumination with almost full focusing efficiency, which is much higher than what is available with zone plate condensers. Sub-50 nm resolution at 8 keV x-ray energy was achieved by utilizing this high-efficiency condenser in a laboratory microscope based on a rotating anode generator.
© 2008 Optical Society of America
Original Manuscript: January 30, 2008
Manuscript Accepted: March 27, 2008
Published: April 28, 2008
Vol. 3, Iss. 6 Virtual Journal for Biomedical Optics
Xianghui Zeng, Fred Duewer, Michael Feser, Carson Huang, Alan Lyon, Andrei Tkachuk, and Wenbing Yun, "Ellipsoidal and parabolic glass capillaries as condensers for x-ray microscopes," Appl. Opt. 47, 2376-2381 (2008)