High-accuracy self-mixing interferometer based on multiple reflections using a simple external reflecting mirror |
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Authors: | WANG Xiu-lin WEI Zheng WANG Rui and HUANG Wen-cai |
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Affiliation: | 1.Department of Physics,Jimei University,Xiamen,China;2.Department of Electronics Engineering,Xiamen University,Xiamen,China |
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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. |
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