Stabilized solid-state laser gyroscope

Details Stabilized solid-state laser gyroscope Stabilized solid-state laser gyroscope

2004-03-23

2009-06-16

Harvey, Minsun (Department: 2828)

Coherent light generators

Particular resonant cavity

Folded cavity

C372S092000, C372S093000, C372S098000, C356S459000, C356S460000

Reexamination Certificate

active

07548572

ABSTRACT:
The field of the invention is that of solid-state laser gyros. One of the major problems inherent in this technology is that the optical cavity of this type of laser is by its nature highly unstable. To reduce this instability, the invention proposes to introduce controlled optical losses into the cavity that depend on the polarization direction by placing in the cavity an optical assembly comprising a polarizing element, a first element exhibiting a reciprocal effect that acts on the polarization of the wave and a second element exhibiting a nonreciprocal effect that also acts on the polarization of the wave, at least one of these two effects being variable, and to electronically slave these losses to the difference in intensity between the counterpropagating modes. Several devices are described that implement either fixed reciprocal effects combined with variable nonreciprocal effects, or vice versa. These devices apply in particular to monolithic cavity lasers and especially to lasers of the neodymium-doped YAG type and also to fiber cavity lasers.

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patent: 2004/0202222 (2004-10-01), Pocholle et al.
patent: 91/10273 (1991-07-01), None

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