Single Element Elliptical Hard X-ray Micro-Optics

Using micro-fabrication techniques we have fabricated a single element kinoform lens in single crystal silicon with an elliptical profile for 12.398 keV x-rays. By fabricating a lens that is optimized to operate at fixed wavelengths, one can reduce absorption. This allows a small radius of curvature, and hence better demagnification of a finite synchrotron source size. The reduced absorption loss also enables optics with a larger aperture, and hence improved resolution for focusing and imaging applications. Our first trial of these lenses has resulted in a 1 micron line focus.