Birefringent active fiber laser sensor

Details Birefringent active fiber laser sensor Birefringent active fiber laser sensor

1995-06-07

1996-10-15

Gutierrez, Diego F. F.

Thermal measuring and testing

Temperature measurement

Nonelectrical, nonmagnetic, or nonmechanical temperature...

374120, 25022714, 25022718, 356 33, 356 44, 73800, 385 12, 372 6, 372102, G01K 1100, G01L 124, G01B 1116

Patent

active

055648320

ABSTRACT:
A birefringent active fiber laser sensor includes one or more fiber lasers 12, 14, 16, each having a pair of Bragg gratings 18, 20, embedded in a fiber 10 and excited by a common pump light 30. At least one of the lasers 12, 14, 16 has a laser cavity wit a predetermined birefrigence and a lasing light at a first lasing frequency along a first polarization axis, and at a second fusing frequency along a second polarization axis. A difference frequency between the first and the second lasing frequencies is related to the magnitude of the birefringence, and the birefringence varies in response to a perturbation. Output light 104 from each of the lasers 12,14,16 is fed to a defraction grating 106 which splits the beam 104 into different wavelength groups, each group having the two lasing frequencies and polarizations of a given laser. Each wavelength group is fed to a corresponding analyzer 122-126 which combines the first and second frequencies and polarizations for each laser to form a lower difference or "beat" frequency, thereby allowing lower frequency detection devices 138-142 to be used.

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