Polarimetric fiber laser sensors

Details Polarimetric fiber laser sensors Polarimetric fiber laser sensors

1994-02-15

1995-09-05

Lee, John D.

Optical waveguides

Optical waveguide sensor

372 6, 385 11, H01S 307

Patent

active

054486572

ABSTRACT:
Apparatus for measuring a physical quantity such as pressure, temperature, strain etc., by using a beat frequency of a longitudinal mode, a transverse mode or two polarization modes of the optical fiber laser. In the rare-earth optical fiber laser as a resonator, there are two different polarization modes normal to each other. Since the optical path lengths of the optical fiber laser for the two polarization modes are different, longitudinal mode frequencies of each polarization mode are different depending on the birefringence of resonator which is varied as an external physical quantity such as pressure, temperature, strain etc. Due to the variation in the birefringence of the resonator, the longitudinal mode frequency difference between two polarization modes becomes varied. This variation is linearly proportional to the physical quantity externally applied. The difference in longitudinal mode frequency between polarization modes can be measured from a beat signal of the polarization modes. Accordingly, it is possible to measure the physical quantity by measuring the variation in polarization mode beat frequency.

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