Fiber laser sensor

Details Fiber laser sensor Fiber laser sensor

1985-08-06

1988-03-15

Lee, John

Coherent light generators

Particular component circuitry

Optical pumping

350 9633, 372 6, 372 20, 372 39, G02B 626, H01S 330

Patent

active

047308869

ABSTRACT:
A fiber laser sensor is comprised of two fiber lasers which are each optically coupled to a third fiber so that energy is exchanged between each of the laser fibers and the third fiber. The coupling is accomplished by arranging the laser fibers parallel to and on either side of a third fiber and properly spacing the three fibers to produce optical coupling along the length of the fibers. The central fiber ends are non-reflective so that light generated by one of the lasers and coupled to the central fiber is lost except for a small fraction of the energy transferred to the other laser. Accordingly, the structure operates with the least loss when the two lasers oscillate at a common frequency but 180.degree. out-of-phase. The resonant cavities of the two fiber lasers are made non-identical by making the path length one cavity slightly longer than the other to produce Vernier tuning of the laser resonant frequency orders relative to each other with only one common resonant frequency. The device can be used as a sensor because the common laser output frequency is sensitive to changes in the optical path length of either or both of the laser cavities.

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Eickhoff, "Temperature Sensing by Mode-Mode Interference in Birefringent Optical Fibers", Optics Letters, vol. 6, No. 4, Apr. 1981, pp. 204-206.

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