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8 January 2008 Study on a small modulation and high precision laser range finder using the self-mixing effect in a single-mode VCSEL
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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.
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Huanqin Wang, Tianpeng Zhao, Jun Xu, Deyong He, and Jiwen Yang "Study on a small modulation and high precision laser range finder using the self-mixing effect in a single-mode VCSEL", Proc. SPIE 6838, Optoelectronic Devices and Integration II, 68381M (8 January 2008); https://doi.org/10.1117/12.755724
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