H - Electricity – 01 – S
Patent
H - Electricity
01
S
345/10
H01S 3/083 (2006.01) G01C 19/66 (2006.01)
Patent
CA 1125895
GCD 78-5 ABSTRACT Weaker secondary laser modes operating slightly above threshold couple with stronger primary counterpropagating laser modes in a ring laser gyroscope and produce a dithering effect which reduces or eliminates lock-in between the primary modes. In one embodiment, cavity length control circuitry is adjusted to detune the cavity length to allow two secondary opposing modes to be generated within the laser gain medium in the cavity while two primary counterpropagating modes operate well above threshold. Another embodiment of the invention includes the use of an external laser beam source for generating secondary waves which are introduced into the ring laser path through a partially transmitting mirror which forms one of the corners of the ring laser closed loop path. In still another embodiment, part of one of the primary waves leaves the ring laser path through a partially reflective mirror and is acted upon by an oscillating mirror which doppler shifts the frequency. This doppler shifted mode is then reintroduced into the ring laser path to couple with the primary mode, which causes an oscillation which diminishes lock-in frequency. In all embodiments, the magnitude and frequency of the secondary mode or modes are controlled to optimize lock-in reduction. -2-
319945
Litton Systems Inc.
Macrae & Co.
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