Laser Diode Self-Mixing Interference Based on Phase Measurement Method
In order to improve the displacement measurement accuracy of the laser diode self-mixing interference (SMI), phase measurement method is introduced in the SMI signal analysis. In this paper, three modulation technique have been proposed: injection current modulation, external cavity length modulation and sinusoidal phase modulation. Measurement principle of the three modulation techinque are briefly explained. Design of the experimental system, measurement results of micro-displacement will be reported.
Wei Gao, Yasuhiro Takaya, Yongsheng Gao and Michael Krystek
M. Wang and D. M. Guo, "Laser Diode Self-Mixing Interference Based on Phase Measurement Method", Key Engineering Materials, Vols. 381-382, pp. 247-250, 2008