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Proceedings Paper

Intra-cavity fiber laser polarization mode beating sensing
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Paper Abstract

We demonstrate a highly-sensitive fiber optic sensor based on polarization mode beating (PMB) techniques for measuring changes in the optical pathlength (i.e., length and refractive index) of a laser cavity. This technique employs the two independent orthogonal modes from within the fiber laser to measure relative phase changes. By heterodyning the modes it is possible to obtain a beating signal and perturb only one of the modes so frequency changes can be measured. This results in the elimination of common intra-cavity noise and sensitivity enhancement. Frequency changes of the PMB signal are evaluated as a function of displacement, intra-cavity pressure and air density and monitored in real-time with high precision and accuracy. The high sensitivity and narrow laser linewidth show a potential application for ultra-sensitive biological measurements, chemical sensing and explosive detection.

Paper Details

Date Published: 14 October 2010
PDF: 4 pages
Proc. SPIE 7839, 2nd Workshop on Specialty Optical Fibers and Their Applications (WSOF-2), 783919 (14 October 2010); doi: 10.1117/12.866884
Show Author Affiliations
Andrea Rosales-García, Boston Univ. (United States)
T. F. Morse, Boston Univ. (United States)
Juan Hernández-Cordero, Univ. Nacional Autónoma de México (Mexico)

Published in SPIE Proceedings Vol. 7839:
2nd Workshop on Specialty Optical Fibers and Their Applications (WSOF-2)
Juan Hernández-Cordero; Ismael Torres-Gómez; Alexis Méndez, Editor(s)

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