Solid medium optical ring laser rotation sensor

Details Solid medium optical ring laser rotation sensor Solid medium optical ring laser rotation sensor

1993-05-21

1995-04-18

Lee, John D.

Coherent light generators

Particular resonant cavity

Folded cavity

356350, 372 6, 372 26, 385 14, H01S 3083

Patent

active

054084920

ABSTRACT:
An optical rotation sensor comprises a light amplification stimulated emission ring laser formed in a solid medium is provided with phase modulator devices which produce push-pull phase modulation of counterpropagating optical waves in the ring thereby enhancing bidirectional lasing in single longitudinal modes in each direction. A frequency selective output coupler couples a predetermined portion of the optical energy at the lasing frequency from the ring to an output waveguide. A substantially U-shaped output waveguide having legs extending away from the ring in opposite directions and toward a common position. Clockwise and counterclockwise light waves are coupled from the ring to the two separate legs of the output waveguide and are directed to the common position to create an interfering light pattern on photodetector apparatus. The interfering light pattern is indicative of the rate of rotation, as defined by the Sagnac effect. Signal processing circuitry connected to the detector derives navigation and flight control information from the detector. In one embodiment, the ring laser and input and output couplers are implemented in a rare earth-doped lithium niobate substrate. In another embodiment, the ring laser and the input and output waveguides are implemented in rare earth-doped optical fibers. In a further embodiment, the ring laser and input and output couplers as well as the phase modulators and the photodetector apparatus are implemented in a single semiconductor substrate and gain electrically supplied to the ring laser.

REFERENCES:
patent: 4530097 (1985-07-01), Stokes et al.
patent: 4592656 (1986-06-01), Egli
patent: 4923299 (1990-05-01), Anderson et al.
patent: 4964131 (1990-10-01), Liu et al.
Ross, Monte, "Laser Applications", Academic Press, 1971, vol. 1, pp. 133-200 (No Month).
Chow, W. W. et al., "The Ring Laser Gyro", Reviews of Modern Physics, vol. 57, No. 1, Jan. 1985, pp. 61-104.
Caroll, Raymond et al., "Backscatter and the Resonant Fiber-Optic Gyro Scale Factor", Journal of Lightwave Technology, vol. 7, No. 12, Dec. 1989, pp. 1895-1900.
Bernard, W. et al., "Fundamentals of a Fiber Integrated Brillouin Ring Laser Gyro", Symposium Gyro Technology 1991, Stuttgart, Germany, pp. 12.0-12.10 (No Month).
Mark, J. et al., "A Rate Integrating Fiber Optic Gyro", Symposium Gyro Technology 1991, Stuttgart, Germany, pp. 13.0-13.10. (No Month).
Lallier, Eric et al., "Nd:MgO:LiNbO.sub.3 Channel Waveguide Laser Devices", IEEE Journal of Quantum Electronics, vol. 27, No. 3, Mar. 1991, pp. 618-625.
Sabert, H. et al., "Spatial Hole Burning in Nd.sup.3 +-fiber Lasers Suppressed by Push-Pull Phase Modulation", Applied Physics Letters 58(21), 27 May 1991, pp. 2323-2325.
Sennaroglu, Alphan et al., "Unidirectional Operation of Rectangular Dielectric Single-Mode Ring Waveguide Lasers", Journal of Lightwave Technology, vol. 9, No. 9, Sep. 1991, pp. 1094-1098.
Brinkmann, R. et al., "Fluorescence and Laser Operation in Single-Mode Ti-Diffused ND:MgO:LiNbO.sub.3 Waveguide Structures", IEEE Journal of Quantum Electronics, vol. 28, No. 2, Feb. 1992, pp. 466-470.
Hansen, P. B. et al., "A 1.54-.mu.m Monolithic Semiconductor Ring Laser: CW and Mode-Locked Operation" IEEE Photonics Technology Letters, vol. 4, No. 5, May 1992, pp. 411-413.
Yu A. et al., "Novel Fibre Optic Gyroscope With a Configuration Combining Sagnac Interferometer With Fibre Ring Resonator", Electronics Letters, 10 Sep. 1992, vol. 28, No. 19, pp. 1778-1780.
Huang, S. et al., "Lock-in Reduction Technique for Fiber-Optic Ring Laser Gyros", Optics Letters, Apr. 1, 1993, vol. 18, No. 7, pp. 555-557.

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