Polarization Uses in Lasergyros.

by H. B. Henning


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Lasergyros provide a compact and elegant approach to strapdown-type angular-rate measurements for navigation, but generally suffer from latch-up: the spurious tendency of two distinct outputs (frequencies whose arithmetic difference indicates the turning rate) to merge altogether at low rate levels. Remedial approaches involving (1) increased lasergyro area, (2) mechanical dithering, and (3) Faraday cell electro-optic dithering, generally introduce operational awkwardness and provide only partial success. The present study investigates a fourth remedy: abstracting two diverse phase-coordinated polarizations from the lasing medium and directing each along separate circulating paths. This investigation covers basic system design alternatives, including subsidiary feedback circuits. Preliminary analysis suggests system accuracies of the order of 10 billionths radian per second or less. 15 pp. (Author)

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