Alignment-free characterization of polarizing beamsplitters
Felipe Calliari (Pontifical Catholic University of Rio de Janeiro)
Pedro Tovar (Pontifical Catholic University of Rio de Janeiro)
Christiano Nascimento (Pontifical Catholic University of Rio de Janeiro)
Breno Perlingeiro (Pontifical Catholic University of Rio de Janeiro)
G. Castro do Amaral (TU Delft - QID/Tittel Lab, Pontifical Catholic University of Rio de Janeiro, Kavli institute of nanoscience Delft)
Guilherme P. Temporão (Pontifical Catholic University of Rio de Janeiro)
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Abstract
Traditional methods for measurement of polarizing beamsplitter (PBS) parameters, especially the extinction ratio, require highly polarized light sources, alignment procedures, and/or experimental parameters that change over time, such as polarization rotations. In this work, a new method is presented that employs unpolarized light and a Faraday mirror. It is shown that precise extinction ratio and insertion loss values can be achieved in three single-sweep measurements without any alignment requirements or time-varying signals of any kind.