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Proceedings Paper

Self-mixing interference in fiber lasers and its applications
Author(s): Ming Wang; Xiajuan Dai
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Paper Abstract

According to the theory of self-mixing interference (SMI) in fiber ring lasers (FRLs), Fourier Transform method is adopted for vibration measurement. The harmonic components increase with the increase of the amplitude of vibration. According to the theory of self-mixing speckle effect (SMSE) in FRLs, the similarity to Gaussian form of probability density distribution increases as the velocity increases. A method based on the fractal boxes of a section of speckle waveform is adopted for demodulation. The relationship between the numbers of boxes and velocities of the object is linear. Dual-channel SMI is presented demonstrating the potential for multiplexing in FRLs. The dual wavelengths of the FRL are selected by two fiber Bragg gratings (FBGs). The output power in one channel is modulated by that in the other channel, which is resulted in the mode competition between the two channels. The experimental results show a good agreement with the simulation results, and indicate that SMI with parallel dual-channel is an efficient approach for multiple displacement measurement.

Paper Details

Date Published: 31 December 2010
PDF: 9 pages
Proc. SPIE 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 75443M (31 December 2010); doi: 10.1117/12.885827
Show Author Affiliations
Ming Wang, Nanjing Normal Univ. (China)
Xiajuan Dai, Nanjing Normal Univ. (China)

Published in SPIE Proceedings Vol. 7544:
Sixth International Symposium on Precision Engineering Measurements and Instrumentation
Jiubin Tan; Xianfang Wen, Editor(s)

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