  We theoretically suggest and experimentally demonstrate a broadband composite
optical rotator that is capable of rotating the polarization plane of a
linearly-polarized light at any chosen angle. The device is composed of an even
number of half-wave plates rotated at specific angles with respect to their
fast-polarization axes. The frequency bandwidth of the polarization rotator in
principal increases with the number of half-wave plates. Here we experimentally
examine the performance of rotators composed of two, four, six, eight and ten
half-wave plates.
