Resonant waveguide laser gyro with a switched source

Details Resonant waveguide laser gyro with a switched source Resonant waveguide laser gyro with a switched source

1985-10-02

1987-04-28

Wan, Gene

Coherent light generators

Particular resonant cavity

Folded cavity

356350, H01S 3083, G01B 902

Patent

active

046619640

ABSTRACT:
Passive ring resonator laser gyro. The gyro eliminates the need for separate frequency control devices for the two counter propagating beams. A semiconductor laser diode, the source, is switched between two frequencies and its output is coupled into a branching waveguide. The light in the waveguide is coupled into a resonant ring waveguide and then sampled by detectors. The laser current is switched at a fixed rate between two values. The values are selected such as to cause the laser output to switch between the resonant frequencies of the two directions of propagation in the ring. These values are determined by a resonance tracking servo. The disclosed laser gyro eliminates the need for active frequency controlled devices in the waveguide structure resulting in less noise, better signal, and reduced cost.

REFERENCES:
patent: 4420259 (1983-12-01), Taylor

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