Achromatic polarization rotator with tunable rotation angle

TL;DR

This paper introduces a broadband composite optical polarization rotator capable of rotating the polarization plane at any angle, demonstrated through experiments with devices composed of multiple half-wave plates, with performance improving as the number increases.

Contribution

It presents a novel broadband polarization rotator design using multiple half-wave plates with tunable rotation angles, expanding the operational bandwidth.

Findings

Performance improves with more half-wave plates

Achieves broadband polarization rotation at any angle

Experimental validation confirms theoretical predictions

Abstract

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.