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Supported by the National High Technology Development Program of China under Grant No 2002AA84TS11, the National Natural Science Foundation of China under Grant No 6987704 and the China Academy of Engineering Physics under Grant No 10176007.
The focusing properties of fractal zone plates (FZPs) with different structure parameters are studied experimentally. The axial irradiance of FZPs is deduced at n=4. The experimental results are in good agreement wi...