Bragg transmission phase plates for the production of circularly polarized x-rays

摘要

A thin-crystal Si (400) Bragg transmission x-ray phase plate has been constructed for the production of 5 to 12 keV circularly polarized x-rays. Using multiple beam diffraction from a GaAs crystal, a direct measurement of the degree of circular polarization as a function of off-Bragg position was made. These measurements indicated nearly complete circular polarization ((vert bar)P(sub c)(vert bar) (ge) 0.95) and full helicity reversal on opposite sides of the rocking curve.