Study on self-mixing interference effect with compensative cavity

LIU Min; ZHANG Yong; SUN Jie-yi

doi:10.3969/j.issn.1001-3806.2010.02.017

LIU Min, ZHANG Yong, SUN Jie-yi. Study on self-mixing interference effect with compensative cavity[J]. LASER TECHNOLOGY, 2010, 34(2): 206-209. DOI: 10.3969/j.issn.1001-3806.2010.02.017

Citation:

LIU Min, ZHANG Yong, SUN Jie-yi. Study on self-mixing interference effect with compensative cavity[J]. LASER TECHNOLOGY, 2010, 34(2): 206-209. DOI: 10.3969/j.issn.1001-3806.2010.02.017

Citation:

LIU Min, ZHANG Yong, SUN Jie-yi. Study on self-mixing interference effect with compensative cavity[J]. LASER TECHNOLOGY, 2010, 34(2): 206-209. DOI: 10.3969/j.issn.1001-3806.2010.02.017

Study on self-mixing interference effect with compensative cavity

Graphical Abstract

Graphical Abstract

Abstract

Abstract

In order to increase the measuring distance and improve the interference signal, Eased on conventional three-mirror structure, a new structure with a compensative mirror in the external cavity was put forward.The new structure was studied experimentally and theoretically. The experimental results showed that the measuring distance increased from 20cm to 60cm, signals with a compensative mirror were strengthened and more stable than those without compensative mirrors.The experimental results also showed that different results produced for different location and reflectivity of the compensative mirror. Based on propagating theory,the model of the structure was deduced, and simulated by means of MATLAB software.The simulation results agreed well with those of experimental results.The results showed that the compensative structure conquered many weaknesses of the conventional self-mixing system.It has provided a useful reference for self-mixing interference measurement in practical way.