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Self-mixing interference inside a single-mode diode laser for optical sensing applications

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4 Author(s)
Wang, W.M. ; Dept. of Electr. Electron. & Inf. Eng., City Univ., London, UK ; Grattan, K.T.V. ; Palmer, A.W. ; Boyle, W.J.O.

This paper presents a theoretical analysis and a comparison with experimental results on self-mixing interference inside a single-longitudinal-mode diode laser. A theoretical model, based on the steady-state equations of the lasing condition in a Fabry-Perot type laser cavity, is described, and through it a satisfactory analysis of self-mixing interference for optical sensing applications is given. In this work, the self-mixing interference produced by an external optical feedback is found to be due to the variations in the threshold gain and in the spectral distribution of the laser output. The gain variation results in an optical intensity modulation, and the spectral variation determines both the modulation waveform and the coherence properties of the interference. The theoretical analysis of the self-mixing interference is seen to yield a simulation of the laser power modulation which is in good agreement with the experiment results reported

Published in:

Lightwave Technology, Journal of  (Volume:12 ,  Issue: 9 )

Date of Publication:

Sep 1994

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