Frequency modulated phase-locked stabilized passive ring laser g

Details Frequency modulated phase-locked stabilized passive ring laser g Frequency modulated phase-locked stabilized passive ring laser g

1986-05-19

1989-03-28

Buczinski, Stephen C.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

372 94, G01B 902

Patent

active

048158518

ABSTRACT:
A passive ring resonator gyroscope having an integral single piece body having first and second resonator cavities. A laser uses the first resonator cavity. The laser has a first cavity adjusting means (PZT1) responsive to a first control signal for providing a single frequency light source (F0). The second resonator cavity is a passive high Q evacuated cavity having a closed optical path tuned to resonate at substantially the light frequency of the first resonator cavity. A modulating means modulates the single frequency light source to form a frequency modulated light source having a center frequency equal to the single frequency light source (F0) and having upper and lower side bands at frequencies Fo+Fm and at F0-Fm, respectively. The frequency modulated light source is split into respective first and second frequency modulated rays. The first ray center frequency is shifted by a fixed offset frequency (F1) to form a propagating light beam (FCW) in the second resonator cavity. The second frequency modulated ray forms a counterpropagating light beam in the second resonator cavity. A cavity servo maintains the propagating light beam (FCW) in the second resonator at peak resonance and frequency shifts the second frequency modulated ray by a variable offset frequency (F2) to maintain the counterpropagating light beam (FCCW) at peak resonance.

REFERENCES:
patent: 3390606 (1968-07-01), Podgorski
patent: 4135822 (1979-01-01), Ezekiel
patent: 4673293 (1987-06-01), Sanders

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