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We experimentally demonstrate a broadband and an ultra-broadband spectralbandwidth polarization rotators. Both polarization rotators have modulardesign, that is, they are comprised of an array of half-wave plates rotated toa given angle. We show that the broadband and ultra-broadband performance ofthe polarization rotators is due to the adiabatic nature of the lightpolarization evolution. In this paper we experimentally investigate theperformance of broadband and ultra-broadband polarization rotators comprisingof ten multi-order half-wave plates or ten commercial achromatic half-waveplates, respectively. The half-wave plates in the arrays are rotated graduallywith respect to each other starting from an initial alignment between the fastpolarization axis of the first one and the incoming linearly polarized light,to the desired polarization rotation angle.

Broadband and ultra-broadband polarization rotators with adiabatic modular design