Scatter symmetrization in multi-mode ring laser gyros

Abstract From the Canadian patent

Abstract, Disclosed herein is a method and apparatus for achieving scatter symmetrization in a multi-mode nonplanar ring laser gyro. The retro scatter effect which results in scatter coupling in each of the left and right circular polarized sets of beams is equalized so, that the scatter coupling may be common-mode rejected during the analysis phase of the ring laser gyro operation. This equalization is achieved by unique orientation of the mirrors and the non-reciprocal polarization rotator. The non-reciprocal rotator which may be a Faraday rotator, is rotated in such a manner that its angle of rotation relative to an angle fixed at the plane of incidence of one of the mirrors of the leg …