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Proceedings Paper

Microcapillary refractive lens as a possible optical element for focusing free-electron laser x-rays
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Paper Abstract

We have fabricated and tested short focal-length compound refractive lenses for X-rays (CRLs) and considered its application for focusing coherent beams. The lens is designed in the form of glass capillary filled by micro-air-bubbles embedded into epoxy. The interface between the bubbles formed 90 to 196 spherical bi-concave microlenses with curvature radius equals to the capillary one. When compared with CRLs manufactured using other methods, the micro-bubble lenses have shorter focal lengths with higher transmission for moderate energy X-rays (e.g. 7 - 12 keV). The lenses are inexpensive and are ideally suited for focusing X-rays generated by high power single pulsed operation coherent X-ray sources with Source size 50-100 microns. We used beamline 2-3 at the Stanford Synchrotron Radiation Laboratory (SSRL) to measure focal lengths between 100-150 mm and absorption apertures between 90 to 120 pm. Transmission profiles were measured giving, for example, a peak transmission of 27 % for a 130-mm focal length CRL at 8 keV. The focal-spot sizes were also measured yielding, for example, an elliptical spot of 5 × 14-μm2 resulting from an approximate 80-fold demagnification of the 0.44 × 1.7 mm2 source.

Paper Details

Date Published: 7 December 2006
PDF: 7 pages
Proc. SPIE 5974, International Conference on Charged and Neutral Particles Channeling Phenomena, 597417 (7 December 2006); doi: 10.1117/12.640106
Show Author Affiliations
Yury I. Dudchik, Institute of Applied Physics Problems, Belarussian State Univ. (Belarus)
Fadei F. Komarov, Institute of Applied Physics Problems, Belarussian State Univ. (Belarus)
Melvin A. Piestrup, Adelphi Technology (United States)
Charles K. Gary, Adelphi Technology (United States)
J. Theodore Cremer, Adelphi Technology (United States)


Published in SPIE Proceedings Vol. 5974:
International Conference on Charged and Neutral Particles Channeling Phenomena

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