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Proceedings Paper

Vibrations and small displacements measurements using self-mixing techniques with multimode diode lasers
Author(s): Horacio Lamela; Jose I. Santos
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Paper Abstract

In the present study, we show the experimental results that we obtained in order to measure vibrations and small displacements using a self mixing technique. In our experimental set up, we achieved a strong optical feedback with a high power, low cost, multimode laser diode. Sweeping the laser diode injection current, and simultaneously gathering the photomonitor current, we obtained the output power vs. current with a reduction of the current threshold and the increase of the device efficiency due to feedback. Also, we present the signal applied to a PZT and the response on the laser's photodiode, as well as the calibration curve at different amplitudes of the stimulus with their corresponding responses. We have been able to experimentally reproduce the results obtained by modeling for the self-mixing technique applied to measuring vibrations.

Paper Details

Date Published: 29 March 2000
PDF: 6 pages
Proc. SPIE 3945, Laser Diodes and LEDs in Industrial, Measurement, Imaging, and Sensors Applications II; Testing, Packaging, and Reliability of Semiconductor Lasers V, (29 March 2000); doi: 10.1117/12.380532
Show Author Affiliations
Horacio Lamela, Univ. Carlos III de Madrid (Spain)
Jose I. Santos, Univ. Carlos III de Madrid (Spain)


Published in SPIE Proceedings Vol. 3945:
Laser Diodes and LEDs in Industrial, Measurement, Imaging, and Sensors Applications II; Testing, Packaging, and Reliability of Semiconductor Lasers V
Geoffrey T. Burnham; Xiaoguang He; Kurt J. Linden; S. C. Wang; S. C. Wang; Geoffrey T. Burnham, Editor(s)

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