Intra-cavity fiber laser polarization mode beating sensing

Andrea Rosales-García; T. F. Morse; Juan Hernández-Cordero

doi:10.1117/12.866884

14 October 2010 Intra-cavity fiber laser polarization mode beating sensing

Andrea Rosales-García, T. F. Morse, Juan Hernández-Cordero

Proceedings Volume 7839, 2nd Workshop on Specialty Optical Fibers and Their Applications (WSOF-2); 783919 (2010) https://doi.org/10.1117/12.866884
Event: Workshop on Specialty Optical Fibers and Their Applications (WSOF-10), 2010, Oaxaca, Mexico

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.

Citation Download Citation

Andrea Rosales-García, T. F. Morse, and Juan Hernández-Cordero "Intra-cavity fiber laser polarization mode beating sensing", Proc. SPIE 7839, 2nd Workshop on Specialty Optical Fibers and Their Applications (WSOF-2), 783919 (14 October 2010); https://doi.org/10.1117/12.866884

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