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Proceedings Paper

Displacement and distance measurement using the change in junction voltage across a laser diode due to the self-mixing effect
Author(s): Yah Leng Lim; K. Bertling; Pierre Rio; J. R. Tucker; A. D. Rakic
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Paper 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.

Paper Details

Date Published: 18 January 2006
PDF: 10 pages
Proc. SPIE 6038, Photonics: Design, Technology, and Packaging II, 60381O (18 January 2006); doi: 10.1117/12.638433
Show Author Affiliations
Yah Leng Lim, The Univ. of Queensland (Australia)
K. Bertling, The Univ. of Queensland (Australia)
Pierre Rio, Univ. Paris-Sud 11 (France)
J. R. Tucker, The Univ. of Queensland (Australia)
A. D. Rakic, The Univ. of Queensland (Australia)


Published in SPIE Proceedings Vol. 6038:
Photonics: Design, Technology, and Packaging II
Derek Abbott; Yuri S. Kivshar; Halina H. Rubinsztein-Dunlop; Shanhui Fan, Editor(s)

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