Bokor Nándor, Iketaki Yoshinori
Department of Physics, Budapest University of Technology and Economics, Budapest, Hungary.
Opt Express. 2009 Mar 30;17(7):5533-9. doi: 10.1364/oe.17.005533.
An efficient technique to achieve isotropic edge enhancement in optics involves applying a radial Hilbert transform on the object spectrum. Here we demonstrate a simple setup for isotropic edge-enhancement in soft-x- ray microscopy, using a single diffractive Laguerre-Gaussian zone plate (LGZP) for radial Hilbert transform. Since the LGZP acts as a beam-splitter, diffraction efficiency problems usually associated with x-ray microscopy optics are not present in this system. As numerically demonstrated, the setup can detect optical path differences as small as lambda/50 with high contrast.
一种在光学领域实现各向同性边缘增强的有效技术是对物体光谱应用径向希尔伯特变换。在此，我们展示了一种用于软X射线显微镜中各向同性边缘增强的简单装置，该装置使用单个衍射拉盖尔 - 高斯波带片（LGZP）进行径向希尔伯特变换。由于LGZP起到分束器的作用，该系统不存在通常与X射线显微镜光学相关的衍射效率问题。如数值演示所示，该装置能够以高对比度检测低至λ/50的光程差。
