Poly-Capillary Optics

Kumakhov also showed how capillary optics could be bundled together to form what are called poly-capillary optics. Beams produced in this manner offer benefits in intensity, but they are strongly focused (and hence these optics are often denoted Kumakhov lenses). Focused spots with diameters down to 40-50 ┬Ám are possible.

For spatially resolved XRF analysis, focused beams are not ideal. X-Rays penetrate into the sample (several micrometers through to several millimeters depending on the particular sample), so that although small spot sizes are produced at the focus point, out of focus beams give rise to fluorescent X-Rays from much larger analysis areas.

In addition, the focused nature of the beam means that micro-XRF imaging of rough samples is difficult - areas in focus will benefit from small spot sizes, but regions showing a height difference will become blurred due to much larger out of focus spot sizes.

Poly-Capillary Optics