Polarimeter arrangement for measuring polarisation plane rotation - has half wave delay plate with electrical rotation of main optical axis

摘要

A polarimeter arrangement contains a half wave delay plate (20) in the beam path of a light beam (10, 11). The plate has an electrical arrangement (22) for rotating its main optical axis at a defined rate of rotation. The half wave plate can be physically rotated or can have electro-optically rotatable main optical axes. The electrical rotation arrangement is associated with a device for deriving a phase reference signal (RS). USE/ADVANTAGE - Measuring rotation of polarisation plane of linearly polarised light beam in measurement path (7) using heterodyne method and tehcnically simple rotation technique.