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Proceedings Paper

Self-mixing interference in fiber ring laser: application for displacement and velocity measurement
Author(s): Ming Wang; Wei Xia; Yi Zhao; Daofu Han
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Paper Abstract

This paper investigates the self-mixing interference in erbium-doped fiber ring laser (FRL) and its application for displacement and velocity sensing. Self-mixing interference in FRL with a parallel dual-channel is proposed. The characteristics of the intensities of the laser in the dual channels with optical feedback are theoretically deduced. The experimental results show a good agreement with the theory, and indicate that self-mixing interference with a parallel dual-channel is an efficient approach for simultaneous multi-channel displacement measurement. Moreover, a new method for velocity detecting based on laser speckle optical feedback injected erbium-doped FRL is presented. Random speckle feedback causes changes in both intensity and frequency of the laser. A dynamic speckled-modulated laser output is observed and processed by FFT analysis. A linear dependant relationship between the velocity of an object and the mean speckle frequency defined as the ratio of the number of fluctuations is obtained, which indicates that speckle optical feedback injected erbium-doped FRL is an effective approach for velocity detecting.

Paper Details

Date Published: 11 September 2012
PDF: 5 pages
Proc. SPIE 8413, Speckle 2012: V International Conference on Speckle Metrology, 84131S (11 September 2012); doi: 10.1117/12.976807
Show Author Affiliations
Ming Wang, Nanjing Normal Univ. (China)
Wei Xia, Nanjing Normal Univ. (China)
Yi Zhao, Nanjing Normal Univ. (China)
Daofu Han, Nanjing Normal Univ. (China)


Published in SPIE Proceedings Vol. 8413:
Speckle 2012: V International Conference on Speckle Metrology
Ángel Fernandez Doval; Cristina Trillo, Editor(s)

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