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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 4,
  • Issue 2,
  • pp. 87-90
  • (2006)

Optimized design of laser range finding system using the self-mixing effect in a single-mode VCSEL

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Abstract

An optimized design of laser range finding system using the self-mixing effect in a single-mode vertical-cavity surface-emitting laser (VCSEL) is proposed. In order to improve the ranging accuracy and expand dynamic measurement range, we apply difference frequency analog phase-locked loop (PLL) instead of fast Fourier transform (FFT) to process signal, and choose the optimum triangular wave frequency fm = 500 Hz and small modulation current 'Delta'I(p-p) = 0.28 mA to modulate single-mode VCSEL. The experiment results show that, without controlling the laser's temperature, the ranging accuracy is better than 2 mm and the measurement dynamic range is as large as 50-500 mm when the sampling time is 0.1 s and the room temperature is 0-55 Celsius degree.

© 2005 Chinese Optics Letters

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