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Displacement and Distance Measurement using the Change in Junction Voltage Across a Laser Diode Due to the Self-Mixing Effect

By Yah Leng Lim, Karl Bertling, Pierre Rio, J. R. Tucker and A. D. Rakic


The conventional self-mixing sensing systems employ a detection scheme utilizing the photocurrent from an integrated photodiode. This work reports on an alternative way of implementing a Vertical-Cavity Surface-Emitting Laser (VCSEL) based self-mixing sensor using the laser junction voltage as the source of the self-mixing signal. We show that the same information can be obtained with only minor changes to the extraction circuitry leading to potential cost saving with reductions in component costs and complexity. The theoretical linkage between voltage and photocurrent within the self-mixing model is presented. Experiments using both photo current and voltage detection were carried out and the results obtained show good agreement with the theory. Similar error trends for both detection regimes were observed

Topics: Self-mixing, Voltage sensing, Laser range finder, Distance measurement, 1706 Computer Science Applications, 2208 Electrical and Electronic Engineering, 2504 Electronic, Optical and Magnetic Materials, 2604 Applied Mathematics, 3104 Condensed Matter Physics
Publisher: SPIE - International Society for Optical Engineering
Year: 2006
DOI identifier: 10.1117/12.638433
OAI identifier:

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