A tunable polarimeter using multilayer interference coatings as both reflection polarizer and transmission phase retarder is described. The portable device bolts onto existing chambers and its rotation axis is precisely aligned to the beam. The upstream transmission phase retarder is tunable by varying its incidence angle, and the downstream polarizer is tunable by translating a laterally graded multilayer. These optical components allow an unambiguous determination of the polarization state of any collimated beam entering the device over at least the 50–800 eV range.
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Kortright et al. (1995) studied this question.
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