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We describe a broadband optical device that is capable of rotating thepolarization plane of a linearly polarized light at any desired angle over awide range of wavelengths. The device is composed of a sequence of half-waveplates rotated at specific angles with respect to their fast-polarization axes.This design draws on an analogy with composite pulses, which is a well-knowncontrol technique from quantum physics. We derive the solutions for therotation angles of the single half-wave plates depending on the desiredpolarization rotation angle. We show that the broadband polarization rotator isrobust against variations of the parameters of both the crystal and the lightfield.

Broadband composite polarization rotator