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Self-mixing Interference Effects in Laser Diodes and Applications in Measurements of Displacement and Velocity

Zawi N.M., and Ibrahim Z.A., and Ahmad H., and Low, K.S., (2002) Self-mixing Interference Effects in Laser Diodes and Applications in Measurements of Displacement and Velocity. Jurnal Fizik Malaysia, 23 (1 - 4). pp. 183-186. ISSN 0128-0333

Full text not available from this repository.

Affiliations

International Islamic University Malaysia, Matriculation Centre
University of Malaya. Faculty of Science. Dept. of Physics.

Abstract

Self-Mixing Interference effect in a semiconductor laser occurs when the optical field, which is reflected by a remote target, is allowed to back-coupled into the laser diode (LD) cavity. A LD which is subjected to optical feedback is named as Self-Mixing Laser Diode (SM-LD) and the detected signal is called Self-Mixing Signal. In this work, experiments have been carried out to understand and confirm the laser behavior under different system parameters on the self-mixing signal. In these feedback schemes, the LD forms a compound cavity with the external target surface, and shows dynamics determined not only by the internal parameters of the laser itself, but also by the characteristics of the external cavity. The undulations and the changes in the inclination at the output power waveform with respect to the direction of the target motion are observed and confirmed. The self-mixing signal gives displacement and velocity of the target simultaneously as well as its directions.

Item Type:Journal
Keywords:Semiconductor laser diode; self-mixing interference; optical feedback
Subjects:Q Science, Computer Science
ID Code:3572

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[4] K. Hara, S. Shinohara, H. Ikeda, H. Yoshida, and M. Sumi, IEEE Trans. Ins, and Meas., 860 (1997).

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