Application of Bragg-Fresnel lenses for microfluorescent analysis and microdiffraction

In creating an X-ray superprobe, the main characteristics are the focus size and the number of photons collected in it (efficiency). In Bragg-Fresnel focusing elements, both characteristics are related to the minimum zone size. However, an increase in the efficiency can be achieved by creating compound elliptical zone plates. To analyze the operation of zone plates of different constructions, an effective program for calculating the image of a point source was developed. The main advantage of the program is a new method for the fast calculation of Kirchhoff integral, detailed description of which is presented in Appendix A. The program allows to obtain a diffraction pattern from real lenses as well as to analyze their changes at different deviations of the lens position from the ideal position with respect to an incident X-ray beam. Different constructions of compound elliptical zone-plates designed on the base of the program and then fabricated are described in the work. The results of using a high-aperture Bragg-Fresnel lens for microfluorescent analysis and microdiffraction are presented.