Direct airborne acoustic wave modulation of Fabry–Perot fiber laser (FPFL) over 100 kHz of operating bandwidth

Pua, Chang Hong and Ahmad, Harith and Harun, Sulaiman Wadi and De La Rue, Richard M. (2012) Direct airborne acoustic wave modulation of Fabry–Perot fiber laser (FPFL) over 100 kHz of operating bandwidth. Applied Optics, 51 (15). p. 2772. ISSN 1559-128X

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Official URL: https://doi.org/10.1364/AO.51.002772

Abstract

The idea of applying a simple Fabry-Perot fiber laser (FPFL) set-up in a free-running condition as an acoustic sensing medium is proposed. Conventional optical microphone requires a stringently aligned diaphragm to mediate the acoustic impedance mismatch between air and silica fiber. Motivated by the difficulty of optical sensing of airborne acoustic waves, a new sensing method is proposed to sense acoustic waves without the assistance of a diaphragm as transducer. By studying the output power fluctuation of the FPFL, the operating bandwidth and sensitivity of the proposed sensing method are determined. The tunability of the resonant frequency from 5 kHz to 85 kHz allows sensing ofacoustic waves in the range of 100 Hz to 100 kHz. Tuning of the resonant frequency can be performed by changing the optical pumping power from as low as 10 mW to 68.5 mW or higher.

Item Type: Article
Uncontrolled Keywords: Acoustic waves; Bandwidth; Diaphragms; Fabry-Perot interferometers; Fiber lasers; Natural frequencies; Optical pumping
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Faculty of Science > Dept of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 07 Jan 2019 04:24
Last Modified: 07 Jan 2019 04:24
URI: http://eprints.um.edu.my/id/eprint/19911

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