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.
© 2006 Optical Society of America
Original Manuscript: December 6, 2005
Revised Manuscript: February 16, 2006
Manuscript Accepted: February 16, 2006
Vol. 1, Iss. 6 Virtual Journal for Biomedical Optics
Ulrich Vogt, Magnus Lindblom, Pambos Charalambous, Burkhard Kaulich, and Thomas Wilhein, "Condenser for Koehler-like illumination in transmission x-ray microscopes at undulator sources," Opt. Lett. 31, 1465-1467 (2006)