Elsevier

Ultramicroscopy

Volume 38, Issue 1, October 1991, Pages 13-22
Ultramicroscopy

Optimum focus for taking electron holograms

https://doi.org/10.1016/0304-3991(91)90105-FGet rights and content

Abstract

Conventional electron microscopy is heavily restricted by the fact that there are no wave optical techniques for the analysis of the electron object wave available other than defocusing; the optimum phase contrast is realized at Scherzer focus. Electron holography offers a way around the problems in that it divides the imaging process in two separate steps: the first is to collect the maximum amount of object information in a hologram taken in the electron microscope, the second is to retrieve all the collected information by means of a rather unrestricted wave optical analysis performed in a computer. The main question is now, at which focus do we collect the maximum amount of information in the hologram?

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