Four mode Zeeman laser gyroscope with minimum hole burning compe

Details Four mode Zeeman laser gyroscope with minimum hole burning compe Four mode Zeeman laser gyroscope with minimum hole burning compe

1978-11-09

1980-07-22

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 902, G01P 900

Patent

active

042137055

ABSTRACT:
A ring laser gyroscope system is provided in which four frequencies of oscillation are allowed to simultaneously propagate within the ring laser cavity, with two modes propagating in each direction. Separation of the resonant frequencies is accomplished through reciprocal, nonreciprocal, and anisotropic optical effects within the laser path, plus Zeeman effect produced by a magnetic field in a predetermined intensity range over the laser gain plasma. The magnetic field substantially parallel to the laser path over the gain medium reduces the effects of hole burning or source depletion when the amplitudes of the field is within a predetermined intensity range to allow frequencies of the four modes to be spaced closer together. The system employs cavity length control circuitry to optimize system output. Rotation of the system results in frequency changes which are detected and processed to yield inertial rotation information.

REFERENCES:
patent: 3973851 (1976-08-01), Ferrar
patent: 4006989 (1977-02-01), Andringa

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