ELECTROMAGNETIC ANGULAR ROTATION SENSING.
Interim Engineering rept. no. 3, 16 Nov 6315 Feb 64,
SPERRY GYROSCOPE CO GREAT NECK N Y
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Faraday ring-laser biasing, without quarterwave plates, is described. Beat frequencies up to 3000 cps have been obtained for fields of 500 gauss using both permanent magnets and electromagnets. For this bias, laser oscillation must occur in a quasi-elliptical mode achieved through Brewster-angle window misalignment. The 108-cm miniature ring laser has shown improved stability, permitting it to be held in the hand and turned and also to be operated on a gyro test table. The current status of this miniature ring and the 8-meter visible ring is described. A graphical technique for the analysis of laser resonator mode configurations has been developed at Sperry by Dr. S. A. Collins. The applications of this technique to ring laser design is presented. An analysis of frequency pulling and mode locking is given, based on the three basic ranges of ring-laser operation rotation at high angular velocity, rotation at very low angular velocity, and varying rotation from high to lower and lower angular velocities. This work is based on a ring-laser model using a twin-line transmission cable in a closed-loop configuration. Equations are presented describing the linear, cold cavity ring operation in the three ranges. Author