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Proceedings Paper

Fiber optic resonator sensors based on comb synthesizers
Author(s): G. Gagliardi
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Paper Abstract

Over the past several years, fiber-optic resonators have been successfully used as mechanical probes by virtue of their intrinsic sensitivity to length changes. In a recent work, we devised a diode-laser system for strain interrogation of a high-finesse fiber Bragg-grating cavity, achieving a 10-13 resolution in the infrasonic and acoustic frequency ranges, thanks to the exceptional stability of an optical frequency comb (OFC). A Pound-Drever-Hall (PDH) frequency locking technique is implemented for low-noise and wide dynamic range readout of the sensor keeping the interrogating laser always linked to the OFC reference. In this way, the low-frequency strain noisefloor is free from laser noise and possibly limited by thermodynamic phase fluctuations or other thermal effects in the fiber.

Paper Details

Date Published: 7 February 2012
PDF: 6 pages
Proc. SPIE 8236, Laser Resonators, Microresonators, and Beam Control XIV, 82361E (7 February 2012); doi: 10.1117/12.906226
Show Author Affiliations
G. Gagliardi, Istituto Nazionale di Ottica-CNR (Italy)

Published in SPIE Proceedings Vol. 8236:
Laser Resonators, Microresonators, and Beam Control XIV
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko, Editor(s)

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