Displacement and distance measurement using the change in junction voltage across a laser diode due to the self-mixing effect

Yah Leng Lim; K. Bertling; Pierre Rio; J. R. Tucker; A. D. Rakic

doi:10.1117/12.638433

18 January 2006 Displacement and distance measurement using the change in junction voltage across a laser diode due to the self-mixing effect

Yah Leng Lim, K. Bertling, Pierre Rio, J. R. Tucker, A. D. Rakic

Author Affiliations +

Proceedings Volume 6038, Photonics: Design, Technology, and Packaging II; 60381O (2006) https://doi.org/10.1117/12.638433
Event: Microelectronics, MEMS, and Nanotechnology, 2005, Brisbane, Australia

Abstract

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.

Citation Download Citation

Yah Leng Lim, K. Bertling, Pierre Rio, J. R. Tucker, and A. D. Rakic "Displacement and distance measurement using the change in junction voltage across a laser diode due to the self-mixing effect", Proc. SPIE 6038, Photonics: Design, Technology, and Packaging II, 60381O (18 January 2006); https://doi.org/10.1117/12.638433

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