Figure 5
Measured (circles) and calculated (lines) deviation angles for the QWP condition for a 400 µm phase-plate for two different incident angles as a function of energy. The insert shows the measured variation of the Stokes parameters with varying angle of linear polarization η at 6.5 keV using two QWPs in the 90° geometry. Plin gives the degree of linear polarization (inverted filled triangles). |