Photodiode-free Doppler velocimeter based on self-mixing effect in commercial VCSELs

Julien Perchoux,Francis Bony,Aleksandar D Rakic,Harold E Dougan

doi:10.1109/icsens.2008.4716438

Photodiode-free Doppler velocimeter based on self-mixing effect in commercial VCSELs

Julien Perchoux, Francis Bony + Show 2 more

https://doi.org/10.1109/icsens.2008.4716438

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Publication Date: Oct 1, 2008

Citations: 15

Affiliation: École Nationale Supérieure d'Électrotechnique, d'Électronique, d'Informatique, d'Hydraulique et des Télécommunications, National Polytechnic Institute of Toulouse, Queensland University of Technology, University of Queensland

#Commercial Vertical-Cavity Surface-Emitting Lasers #Self-mixing Technique + Show 8 more

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Abstract

In this paper, we explore a new signal acquisition method for laser Doppler velocimeter based on the self-mixing technique. The self-mixing technique is applied on commercial multimode transverse Vertical-Cavity Surface-Emitting Lasers (VCSELs) and the signal is acquired by amplification of the junction voltage of the laser diode when it was usually picked-up with an external photodiode. The sensor developed exhibits up to 25 dB signal-to-noise ratio for a wide velocity range. We present a study of the sensitivity of such photodiode-free sensors versus the laser static conditions and we compare the results with usual photodetected signals. Finally we expose the advantages of this technique and propose new applications for self-mixing sensors.

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