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Laser Doppler velocimeter using the self-mixing effect of a fiber ring laser with ultra-narrow linewidth

  • Rong Xiang
  • Chenchen Wang
  • Liang LuEmail author
Research Article
  • 3 Downloads

Abstract

Self-mixing laser velocimeter using a fiber ring laser with ultra-narrow linewidth is proposed and investigated in this paper. Experimentally, a saturable absorber consisting of a segment un-pumped Er3+-doped fiber (EDF) is used to squeeze the spectrum linewidth of fiber ring laser. In addition, we numerically plotted the self-mixing signal of Doppler velocity measuring system with different speeds. The experimental results show that Doppler shift is linearly proportional to the speed of rotating disk, which is in good agreement with theory analysis. Moreover, the measuring range of speed is from 23.5 to 635.8 mm/s and relative error is less than 2.5%, which indicate the fiber laser with ultra-narrow linewidth has a number of potential applications for interferometric fiber sensors and gas sensors.

Keywords

Self-mixing interference Doppler shift Velocimeter Fiber ring laser 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 61307098, 61741501); Foundation for Scientific Research and Technical Leaders in Anhui province (Grant No. 2017H124); Natural Science Fund of University of Anhui Province (Grant Nos. KJ2018ZD002, KJ2018A0457) and Open Fund for Discipline Construction, Institute of Physical Science and Information Technology, Anhui University.

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Copyright information

© The Optical Society of India 2019

Authors and Affiliations

  1. 1.Key Laboratory of Opto-Electronic Information Acquisition and Manipulation of Ministry of EducationAnhui UniversityHefeiChina
  2. 2.College of Mechanical and Electronic EngineeringChao Hu UniversityChaohuChina
  3. 3.Institute of Physical Science and Information Technology, Anhui UniversityHefeiChina

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