Erinnerungen aus der Krümmerschen Anstalt und aus des Verfassers eigner Schulzeit

http://tartu.ester.ee/record=b2414688~S1*es

Lithium Fluoride Transmission Phase-Retarder for X-rays

The polarization state of the transmitted beam in Bragg-case X-ray dynamical diffraction was determined in dependence on the deviation from the centre of the reflection curve. Because of their low absorption, lithium fluoride crystals were examined. The transmission rocking curves were detected by means of a linear analyzer set at different azimuthal positions. In this way, the effect of the phase plate can be easily visualized from the occurrence of intensity oscillations. An almost circularly polarized beam could be produced from an incident linearly polarized beam using this phase retarder. The complete polarization state of this beam was determined by the insertion of a second phase retarder adjusted to give a phase shift of [pi]/2 and calculation of the three Stokes parameters

Generation and Proof of Elliptically Polarized X-Rays

Abstract Using an arrangement being analogous to optics of visible light the phase relation of the mutually perpendicularly polarized wave fields are examined in the Laue case of X-ray diffraction. Bragg reflections at an angle of reflection of about 45° are used as polarizer and analyzer. The different phase relations result from different thicknesses of a wedge-shaped silicon crystal, which is placed between the polarizer and the analyzer and adjusted for the symmetric 220-CuKαl-Laue case. The determined polarization states produced by coherent excitation of both σ-polarized and π-polarized waves in the silicon crystal coincide very well with calculations of the dynamical theory of X-ray diffraction.</jats:p