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The original objective of holography was to improve the resolution of an electron microscope. Since an aberration-free system cannot be achieved by the combination of concave and convex lenses in the electron case because of the lack of a concave electron lens, the resolution is determined by the aberrations of the objective lens and not by a fundamental limit of the electron wavelength. In fact, it was theoretically verified by Scherzer [8.1] that an axially-symmetric magnetic field can function only as a convex lens for an electron beam.
KeywordsSpatial Frequency Interference Fringe Lattice Image Lattice Fringe Diffract Beam
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