WANG Xiu-lin,WEI Zheng,WANG Rui,HUANG Wen-cai.High-accuracy self-mixing interferometer based on multiple reflections using a simple external reflecting mirror[J].Optoelectronics Letters,2018,14(3):161-163 High-accuracy self-mixing interferometer based on multiple reflections using a simple external reflecting mirror Author Name Affiliation WANG Xiu-lin  Department of Physics, Jimei University, Xiamen 361021, China  WEI Zheng  Department of Electronics Engineering, Xiamen University, Xiamen 361005, China  WANG Rui  Department of Electronics Engineering, Xiamen University, Xiamen 361005, China  HUANG Wen-cai  Department of Electronics Engineering, Xiamen University, Xiamen 361005, China  Abstract:       A self-mixing interferometer (SMI) with resolution twenty times higher than that of a conventional interferometer is developed by multiple reflections. Only by employing a simple external reflecting mirror, the multiple-pass optical configuration can be constructed. The advantage of the configuration is simple and easy to make the light re-injected back into the laser cavity. Theoretical analysis shows that the resolution of measurement is scalable by adjusting the number of reflections. The experiment shows that the proposed method has the optical resolution of approximate λ/40. The influence of displacement sensitivity gain (G) is further analyzed and discussed in practical experiments. Hits: 1538 Download times: 0 View Full Text    Download reader