Gaupp, A.; MacDonald, M.; Schäfers, F.: A W/B4C transmission multilayer as an achromatic phase shifter in the XUV: some experimental aspects. In: Garrett, R... [Ed.] : SRI 2009 : the 10th International Conference on Synchrotron Radiation Instrumentation ; Melbourne, Australia, 27 September - 2 October 2009Melville, NY: American Inst. of Physics, 2010 (AIP conference proceedings ; 1234). - ISBN 978-0-7354-0782-4, p. 665-668
Abstract:
Completing previous investigations we study a W/B4C transmission multilayer with 350 periods each 1.74 nm as a phase shifter for polarization analysis between 720 eV and 1020 eV. The FWHM of the Bragg curve is as small as 0.18 degree = 3 mrad and thus smaller than the inherent accuracy of most polarimeters. We discuss some of the experimental implications and limitations. We obtain a phase shift of up to 24 degrees through out the spectral range.