POLARISATION ROTATOR ASSOCIATED WITH REFLECTIVE SURFACE

摘要

An optical device wherein rotation of a polarised beam of light can be achieved with passive optical elements. The device comprises a non-reciprocal rotator element before a reflective surface. The light passes in to the rotator and is reflected back again by the reflective surface the beam thus being rotated on each passage to give an accumulative rotation. An assembly including a further partially reflective surface can be constructed which approximates a Fabry-Perot cavity.