Chinese Optics Letters, 2006, 4 (2): 0287, Published Online: Jun. 6, 2006
Optimized design of laser range finding system using the self-mixing effect in a single-mode VCSEL
280.3400 laser range finder 250.7260 vertical cavity surface emitting lasers 140.3570 lasers single-mode
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.
Huanqin Wang, Tianpeng Zhao, Jun Xu, Deyong He, Liang Lv, Huaqiao Gui, Wei Huang, Hai Ming, Jianping Xie. Optimized design of laser range finding system using the self-mixing effect in a single-mode VCSEL[J]. Chinese Optics Letters, 2006, 4(2): 0287.