Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1990-08-09
1992-04-28
Turner, Samuel A.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
372 1, 372 6, G01C 1972
Patent
active
051081830
ABSTRACT:
An improved broadband light source for a Sagnac interferometer includes a waveguide, such as a fluorescent optical fiber, that is pumped by a pump source with a sufficient intensity to generate temporally incoherent light. The fluorescent optical fiber has first and second ends, one end being an input end of the fiber. The broadband light is provided at an output of the fluorescent optical fiber and is input to the interferometer. In order to prevent laser oscillations between the light source and the interferometer, one end of the fluorescent optical fiber is formed so as to prevent reflections. The light output from the fluorescent fiber to the interferometer comprises only that light that initially propagates toward the output of the optical fiber. In one embodiment of the light source, the pump light from the pump source is coupled into the fluorescent optical fiber in a direction so that it travels away from the output of the fluorescent optical fiber towards the first end. In an alternative embodiment, the fluorescent optical fiber is a doubly clad optical fiber having a first acceptance region and a second acceptance region at the first end. The pump light is introduced into an aperture window between the two acceptance regions so that the pump light can be introduced into the first end at an angle without requiring a reflective surface at the first end.
REFERENCES:
patent: 3826992 (1974-07-01), Friedl
patent: 4410275 (1983-10-01), Shaw et al.
patent: 4456377 (1984-06-01), Shaw et al.
patent: 4529312 (1985-07-01), Pavlath et al.
patent: 4529313 (1985-07-01), Petermann et al.
patent: 4536058 (1985-09-01), Shaw et al.
patent: 4546476 (1985-10-01), Shaw et al.
patent: 4556279 (1985-12-01), Shaw et al.
patent: 4637025 (1987-01-01), Snitzer et al.
patent: 4637722 (1987-01-01), Kim
patent: 4671658 (1987-06-01), Shaw et al.
patent: 4687330 (1987-09-01), Lefevre
patent: 4779975 (1988-10-01), Kim
patent: 4815079 (1989-03-01), Snitzer et al.
patent: 4836676 (1989-06-01), Kim et al.
patent: 4842409 (1989-06-01), Arditty et al.
patent: 4848910 (1989-07-01), Dupraz
patent: 4859016 (1989-08-01), Shaw et al.
patent: 4881817 (1989-11-01), Kim et al.
patent: 4938556 (1990-07-01), Digonnet et al.
patent: 4964131 (1990-10-01), Liu et al.
E. Desurvire, "Analysis of Transient Gain Saturation and Recovery in Erbium-Doped Fiber Amplifiers", IEEE Photonics Technology Letters, vol. 1, No. 8, Aug. 1989, pp. 196-199.
M. J. F. Digonnet et al., "Analysis of a 1060 nm Nd:SiO.sub.2 Superfluorescent Fiber Laser", IEEE Journal of Lightwave Technology, vol. 7, Jul. 1989, pp. 1009-1015.
M. J. F. Digonnet, "Theory of Operation of Three- and Four-Level Fiber Amplifiers and Sources", SPIE, vol. 1171, Fiber Laser Sources and Amplifiers, 1989, pp. 8-26.
K. A. Fesler et al., "Behavior of Broadband Fiber Sources in a Fiber Gyroscope", SPIE, vol. 1171, Fiber Laser Sources and Amplifiers, 1989, pp. 346-352.
K. A. Fesler et al., "Fiber Gyro Experiment Using Fiber Laser Source", Electronics Letters, vol. 25,8, Apr. 13, 1989, pp. 534-536.
K. A. Fesler et al., "Stable Fiber-Source Gyroscopes", Optics Letters, Mar. 21, 1990, pp. 1321-1323.
B. Y. Kim, "Fiber-Optic Device Research at Stanford University", SPIE, vol. 1169, Fiber Optic and Laser Sensors VII, pp. 10-15.
K. Liu et al., "Broadband Fiber Lasers", Abstract of oral presentation presented at Optical Society of America Annual Meeting, Santa Clara, Calif., Oct. 31-Nov. 4, 1988.
K. Liu et al., "Broadband Diode-Pumped Fiber Laser", Electronics Letters, vol. 24,14, Jul. 7, 1988, pp. 838-840.
P. R. Morkel et al., "Erbium-Doped Fibre Superfluorescent Source for the Fibre Gyroscope", Optical Fiber Sensors, pp. 143-148.
H. Po et al., "Double Clad High Brightness Nd Fiber Laser Pumped by GaAlAs Phased Array", Optical Fiber Communication Conference (OFC '89), Houston, Tex., Feb. 6-9, 1989, Post Deadline Paper, pp. PD7-1 through PD7-4.
P. F. Wysocki et al., "Broadband Operation of Erbium-Doped Silica-Based Fiber Lasers", SPIE, vol. 1171, Fiber Laser Sources and Amplifiers, Sep. 6-8, 1989, pp. 261-270.
P. F. Wysocki et al., "Electronically Tunable, 1.55-.mu.m Erbium-Doped Fiber Laser", Optics Letters, vol. 15, No. 5, Mar. 1, 1990, pp. 273-275.
Digonnet Michel J. F.
Fesler Kenneth A.
Fling John J.
Kim Byoung Y.
Shaw Herbert J.
The Board of Trustees of the Leland Stanford Junior University
Turner Samuel A.
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