Polarization calibration source for the Polstar spectropolarimeter.

This paper describes material and configuration trades for the design of a special source that will be used for pre-launch calibrations of Polstar: the polarization calibration source (PCS). The PCS generates a highly polarized imaged beam at the f/# of Polstar. The PCS will be used to calibrate Polstar polarimetrically, photometrically, and spectrally. This paper identifies design approaches that permit the production of highly polarized light to wavelengths as small as 110 nm.