Ring laser gyro and magnetic mirror therefor

Details Ring laser gyro and magnetic mirror therefor Ring laser gyro and magnetic mirror therefor

1988-09-02

1990-11-06

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

350375, 356351, 372 94, 372 99, G01C 1964, G02F 105

Patent

active

049681362

ABSTRACT:
A laser gyroscope is formed as a sealed, unitary assembly of mirrors optically contacted to a monolithic gyro block without any means, such as Brewster windows, for isolating the laser plasma from any of the mirrors. The mirrors are fabricated with hard multilayer dielectric films which can withstand plasma exposure. A magnetic mirror utilizing the transverse Kerr effect to separate the frequencies of counter-propagating beams, and to avoid lock-in, includes a Ni-Fe alloy layer over which is directly deposited a thin iron or iron alloy layer to form a rotationally switchable Kerr effect combination. The magnetic field for switching is generated by an electric current developed in two pairs of orthogonally disposed wires embedded in the substrate immediately below the iron and Ni-Fe alloy layers. A specially designed multilayer dielectric stack is disposed on one of the mirrors, for example over the iron and Ni-Fe alloy layers on the magnetic mirror, and is configured to suppress S mode oscillation in order to limit the gyro to P mode operation.

REFERENCES:
patent: 3851973 (1974-12-01), Macek
patent: 4009933 (1977-03-01), Firester
patent: 4195908 (1980-04-01), Kestigian et al.
patent: 4201954 (1980-05-01), Vander Wal et al.
patent: 4442414 (1984-04-01), Carter
patent: 4522496 (1985-06-01), Sanders

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