Study on the focus performance of micro-focus Fresnel zone plate

Abstract

The performance of micro-focus Fresnel zone plate(MFZP) with the outermost width of 150nm is tested using the Ti spectral line. Experimental data indicates that the image of pinhole with diameter of 125μm fully responses to a pixel of the X-ray CCD camera. Furthermore，the X-ray focal spot is tested with a magnification of 66 by using laser striking the Ti planar target. The MFZP's point spread function is simulated with the integral formula of Fresnel-Kirchhoff diffraction. The simulated results indicate that the MFZP strongly focuses at double foci. The same results are obtained when the object distance and image distance change but keeping the relation of the lens unchanged. The simulation and the experiment indicate that MFZP can be applied to point-to-point imaging of X-ray to realize high spatial resolution imaging for the laser plasmas.