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Investigation of the effects of partial coherence on exit wave reconstruction
Author(s) -
ALLEN L. J.,
MCBRIDE W.,
O'LEARY N. L.,
OXLEY M. P.
Publication year - 2004
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.0022-2720.2004.01384.x
Subject(s) - coherence (philosophical gambling strategy) , optics , amplitude , physics , function (biology) , iterative reconstruction , computer science , computer vision , quantum mechanics , evolutionary biology , biology
Summary In a recent work we presented an iterative wave function reconstruction (IWFR) method that reconstructs a wave function from measurements of its amplitude taken as it propagates in free space (a focal series of images). Although the ideal environment for application of the IWFR method is in a coherent imaging system, it has been developed so that it can be applied in a partially coherent imaging system, in particular for a high‐resolution transmission electron microscope using a field‐emission gun. In this paper we investigate the effects of partial coherence on the accuracy of results obtained using the IWFR method. We then show how results obtained under such conditions can be improved by estimating and subtracting components from the amplitude measurements of the wave function that derive from incoherence in the electron beam.