Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1995-02-28
1996-05-14
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01C 1968
Patent
active
055173055
ABSTRACT:
A Brillouin ring laser gyro has a fiber ring resonator, which exhibits a sequence of resonance frequencies, neighboring resonance frequencies differ by a free spectral range. Two pump laser waves of opposite directions are generated. The frequency difference of these pump laser waves is an integral multiple of the free spectral range of the fiber ring resonator. The frequencies of the pump laser waves coincide with resonance frequencies of the fiber ring resonator. Due to stimulated Brillouin scattering, two Brillouin ring lasers having opposite directions of propagation are excited. Frequency fluctuations occur with such two-color ring laser gyros. The invention is based on the discovery of the causes of such frequency fluctuations and, consequently, provides means for the damping of feedback components of the laser light originating outside the fiber ring resonator. Various examples of such means are disclosed.
REFERENCES:
"Stimulated Brillouin Fiber-Optic Laser Gyroscope", F. Zarinetchi et al., Feb. 15, 1991, vol. 16, No. 4, pp. 228-231, Optics Letters.
"Narrow-Linewidth Stimulated Brilluoin Fiber Laser and Applications", S. P. Smith et al., Mar. 15, 1991, vol. 16 No. 6, Optics Letters, pp. 393-395.
"Possibility of Using An Optical Fiber Brillouin Ring Laser for Inertial Sensing", P. J. Thomas et al., Applied Optics, vol. 19, No. 12, Jun. 15, 1980.
Bodenseewerk Geratetechnik GmbH
McGraw Vincent P.
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