Highly sensitive fiber random-grating-based random laser sensor for ultrasound detection

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1364/OL.42.001353
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Name affiliation
  1. National Research Council of Canada. Security and Disruptive Technologies
FormatText, Article
Journal titleOptics Letters
ISSN0146-9592
1539-4794
Volume42
Issue7
Pages1353–1356
Abstract
A novel highly sensitive ultrasound sensor based on a random fiber laser is proposed and demonstrated for the first time, to the best of our knowledge. The random fiber laser is constructed with the erbium-doped fiber gain. A fiber random grating provides random-distributed feedback for the random laser and acts as an ultrasound sensing head. The random laser can operate in a single-mode lasing scenario, which offers linear and pure temporal responses to the broadband ultrasonic acoustic emission from 20 kHz to 0.8 MHz. The multiple-interfering reflection spectrum of the random grating provides a large number of steep peak areas over a broad spectral range, which significantly enhances the sensitivity of the random laser sensor and makes it an ideal sensor in harsh environments with large temperature or strain variations. The proposed laser sensor offers signal-to-noise ratio improvement up to 20 dB and higher sensitivity compared with conventional piezoelectric acoustic sensors.
Publication date
PublisherOSA Publishing
LanguageEnglish
Peer reviewedYes
NPARC number23002182
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Record created2017-08-30
Record modified2020-03-16
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