Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1986-11-06
1992-01-14
Turner, Samuel
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
372 94, G01C 1968
Patent
active
050804871
ABSTRACT:
An out of plane ring laser gyroscope comprises a frame and a cavity formed in the frame to provide a non-planar closed optical pattern. A gain medium produces two light beams propagating in opposite directions in the cavity. A magnetic device applies an axial magnetic field to the gain medium to allow only light of opposite circular polarizations to lase in opposite directions. The gain medium and resonant cavity alone will allow left and right circularly polarized modes to lase in both clockwise and anticlockwise directions simultaneously. The application of the axial magnetic field to the gain region shifts the center of the gain profile for the clockwise right circularly polarized and anticlockwise left circularly polarized beams with respect to the gain profile center for the anticlockwise right circularly polarized and clockwise left circularly polarized beams. The cavity length can then be adjusted so that lasing action in two of the four modes is suppressed leaving only modes of opposite polarization propagating in opposite directions. The out of plane geometry of the cavity forces these modes to resonate at greatly different frequencies and hence prevents frequency locking over a very large range of input rotation rates.
REFERENCES:
patent: 3395270 (1968-07-01), Speller
patent: 3411849 (1968-11-01), Aronowitz
patent: 3503005 (1970-03-01), Mocker
patent: 3697887 (1972-10-01), Lee et al.
patent: 3807866 (1974-04-01), Zingery
patent: 3826575 (1974-07-01), Walter, Jr.
patent: 3854819 (1974-12-01), Andringa
patent: 3973851 (1976-08-01), Ferrar
patent: 4213705 (1980-07-01), Sanders
patent: 4229106 (1980-10-01), Dorschner
patent: 4247832 (1981-01-01), Sanders et al.
patent: 4267478 (1981-05-01), Ljung et al.
patent: 4383763 (1983-05-01), Hutchings et al.
patent: 4470701 (1984-09-01), Smith
patent: 4637255 (1987-01-01), Martin
A. D. White, "Frequency Stabilization Gas Lasers", IEEE, Journal of Quantum Electronics, vol. QE-1, No. 8, Nov. 1965, pp. 349-357.
H. de Lang, "Eigenstates of Polarization in Gas Lasers", pp. 429-440.
Facklam, "Ultra-Stable Laser Clock", 36th Annual Frequency Control Symposium, 1982.
Facklam, "Ultra-Stable Laser Clock, Second Generation".
Coccoli, "An Overview of Laser Gyros", 12th Joint Services Data Exchange for Inertial Systems, Norfolk, Va. 1978.
Menegozzi et al., "Theory of a Ring Laser", 1973, Physical Review, vol. 8, No. 4, pp. 2103-2125.
Kilpatrick, "The Laser Gyro", Oct. 1967, IEEE Spectrum, pp. 44-55.
Chow, et al. "Multioscillator Laser Gyros," IEEE Journal of Quantum Electronics, vol. QE 16, No. 9, Sep. 1980, pp. 918-936.
Litton Systems Inc.
Turner Samuel
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