Dispersion equalized ring laser gyroscope

Details Dispersion equalized ring laser gyroscope Dispersion equalized ring laser gyroscope

1983-06-29

1984-09-11

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

350276SL, 350375, 372 94, 372103, G01C 1964, G02F 109

Patent

active

044707010

ABSTRACT:
A ring laser gyroscope system uses a non-planar path and no-depolarizing Faraday bias means to achieve four-frequency differential operation. The use of the non-planar path eliminates the crystal rotator normally used to provide reciprocal bias and therefore eliminates scattering surfaces and a major cause of thermal sensitivity. The non-depolarizing Faraday means, such as a thin glass slab having a component of magnetic field along the optic axis of the laser, is used to reduce the corresponding thermal sensitivity of the traditional Faraday bias element normally implemented by a crystal such as quartz. Eliminating these major sources of drift then allows higher-order sources of drift to be corrected. Zeeman splitting of the laser gain medium is used to provide an equal amount of dispersion to each of the two counter-travelling waves of each wave pair, thus eliminating small amounts of drift due to the different phase shifts produced in the propagating waves by the gain medium.

REFERENCES:
patent: 3642373 (1972-02-01), Catherin
patent: 3973851 (1976-08-01), Ferrar
patent: 4110045 (1978-08-01), Smith, Jr. et al.
patent: 4213705 (1980-07-01), Sanders
patent: 4247832 (1981-01-01), Sanders et al.
patent: 4284329 (1981-08-01), Smith et al.

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