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The generalization of the circular zone plate with ring focus onto elements focusing light into an ellipse is proposed. The transmittance of obtained zone plate is given in explicit form basing on scaling property of Fourier transform.
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Andrzej Kolodziejczyk, Maciej Sypek, Zbigniew Jaroszewicz, Salvador Bara Vinas, "Zones plates with elliptical foci curve," Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); https://doi.org/10.1117/12.34732