Cordier, P., Dupont, S., Douay, M., Martinelli, G., Bernage, P., Niay, P., Bayon, J.F. and Dong, L.
Evidence by transmission electron microscopy of densification associated to Bragg grating photoimprinting in germanosilicate optical fibers
Applied Physics Letters, 70, (10), . (doi:10.1063/1.118531).
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We propose and demonstrate a polarimetric Er3+-doped fiber distributed-feedback laser sensor in which a force applied transversely along the fiber laser induces a birefringence that gives rise to a change in the beat frequency between the two orthogonally polarized laser modes. We measure a sensitivity of ~9.6 GHz/(N/mm), a wide dynamic range with stable two-mode operation for frequency separations up to 50 GHz, and high sensor resolution owing to the narrow beat frequency bandwidth of <10 kHz. The temperature sensitivity is dominated by the temperature dependence of the inherent birefringence. which was measured to be -130 kHz/°C. The sensor permits independent pressure-force and temperature measurements
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