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X-shooter is one of the most popular instruments at the VLT, offeringinstantaneous spectroscopy from 300 to 2500 nm. We present the design of asingle polarimetric unit at the polarization-free Cassegrain focus that servesall three spectrograph arms of X-shooter. It consists of a calcite Savart plateas a polarizing beam-splitter and a rotatable crystal retarder stack as a"polychromatic modulator". Since even "superachromatic" wave plates have awavelength range that is too limited for X-shooter, this novel modulator isdesigned to offer close-to-optimal polarimetric efficiencies for all Stokesparameters at all wavelengths. We analyze the modulator design in terms of itspolarimetric performance, its temperature sensitivity, and its polarizedfringes. Furthermore, we present the optical design of the polarimetric unit.The X-shooter polarimeter will furnish a myriad of science cases: frommeasuring stellar magnetic fields (e.g., Ap stars, white dwarfs, massive stars)to determining asymmetric structures around young stars and in supernovaexplosions.

Design of a Full-Stokes Polarimeter for VLT/X-shooter