title: Condenser for Koehler-like illumination in transmission x-ray microscopes at undulator sources.
abstract: We report on a novel condenser for full-field transmission x-ray microscopes that use synchrotron radiation from an undulator source. The condenser produces a Koehler-like homogeneous intensity distribution in the sample plane and eliminates object illumination problems connected with the high degree of spatial coherence in an undulator beam. The optic consists of a large number of small linear diffraction gratings and is therefore relatively easy to manufacture. First imaging experiments with a prototype condenser were successfully performed with the Twinmic x-ray microscope at the Elettra synchrotron facility in Italy.
authors.affiliation: Biomedical and X-ray Physics, Royal Institute of Technology/Albanova, Stockholm, Sweden. ulrich.vogt@biox.kth.se
authors.forename: Ulrich
authors.initials: U
authors.lastname: Vogt
authors.forename: Magnus
authors.initials: M
authors.lastname: Lindblom
authors.forename: Pambos
authors.initials: P
authors.lastname: Charalambous
authors.forename: Burkhard
authors.initials: B
authors.lastname: Kaulich
authors.forename: Thomas
authors.initials: T
authors.lastname: Wilhein