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Alternate production of right- and left-handed circular polarizations was performed with a X-ray phase retarder of the transmission type in Bragg geometry. A piezo-driven oscillation stage was constructed for flipping the X-ray phase retarder around the Bragg angle by 10∼80 arcseconds in the bistable mode. Switching of photon helicities up to 100 Hz was achieved at λ=0.1463 nm
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Hirano et al. (1992) studied this question.
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