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Optically biased laser gyro

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Abstract

We report what we believe to be the first known observation of a strapdown ring laser that exhibits no frequency locking, ft is weft known “that, for sufficiently high rotation rates, the beat note between the frequencies of the clockwise and anticlockwise traveling waves in a ring laser is proportional to the rotation rate of the device. However, backscattering couples the counterrotating waves, and at low rotation rates the frequencies tend to lock. Laser gyros often contain body-shake dither mechanisms to mitigate this lock-in problem. This method has mechanical support problems similar to those of the mechanical gyro. In addition, since a dithered gyro spends part of its time in the lock-in region, rotation information is sometimes lost.

© 1981 Optical Society of America

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