Apparatus for use in ring laser gyroscopes

Details Apparatus for use in ring laser gyroscopes Apparatus for use in ring laser gyroscopes

1994-07-29

2000-07-11

Epps, Georgia

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359485, 356350, G02F 109

Patent

active

060881496

ABSTRACT:
The invention is a focusing polarization rotator for use in the resonant mirror system of a ring laser gyroscope. The focusing polarization rotator accomplishes the traditional task of rotating the plane of polarization of a light beam that passes through it and at the same time performs a focusing function on the light rays. In a resonant mirror system, the device acts to constrain the transverse dimensions of light beams that follow the closed light-beam path established by the resonant mirror system thereby obviating the need for one or more curved mirrors that usually perform this function. The focusing polarization rotator is a wedge-shaped lens made from either a magneto-optic transparent material with a magnetic field within the lens or a material having different indices of refraction for left- and right-circularly-polarized light. The wedge shape of the lens greatly improves the bias stability of the RLG in which it is used.

REFERENCES:
patent: 4284329 (1981-08-01), Smith et al.
patent: 4294509 (1981-10-01), Nagao
patent: 4698816 (1987-10-01), Chun
patent: 4960331 (1990-10-01), Goldman et al.
patent: 4969743 (1990-11-01), Cote et al.

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