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Proceedings Paper

Study on a small modulation and high precision laser range finder using the self-mixing effect in a single-mode VCSEL
Author(s): Huanqin Wang; Tianpeng Zhao; Jun Xu; Deyong He; Jiwen Yang
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Paper Abstract

The paper proposes a small modulation and high precision laser range finder using the self-mixing effect in a single-mode vertical-cavity surface-emitting laser (VCSEL). According to the characteristic curve of single-mode VCSEL, the nonlinear distortion of Δλ/ΔI is severe and related with the modulation current ΔI, which worsens the system ranging accuracy obviously. In this paper, by applying small current to modulate single-mode VCSEL and specific circuits to process photoelectric signal, the system ranging accuracy is improved obviously. The experiment results show that, using small modulation current ΔI= 0.28 mAp-p, modulation frequency fm = 500 Hz to modulate single-mode VCSEL, and applying difference frequency analog phase-locked loop (APLL) to process the self-mixing beat frequency signals that exist phase abrupt changes, when the sampling time is 0.1 s, the measurement dynamic range is as large as 50 ~ 500 mm, and the ranging accuracy is better than 2 mm.

Paper Details

Date Published: 8 January 2008
PDF: 6 pages
Proc. SPIE 6838, Optoelectronic Devices and Integration II, 68381M (8 January 2008); doi: 10.1117/12.755724
Show Author Affiliations
Huanqin Wang, Univ. of Science and Technology of China (China)
Tianpeng Zhao, Univ. of Science and Technology of China (China)
Jun Xu, Univ. of Science and Technology of China (China)
Deyong He, Univ. of Science and Technology of China (China)
Jiwen Yang, Univ. of Science and Technology of China (China)


Published in SPIE Proceedings Vol. 6838:
Optoelectronic Devices and Integration II
Xuping Zhang; Hai Ming; Maggie Yihong Chen, Editor(s)

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