Coherent laser detection of the femtowatt-level frequency-shifted optical feedback based on a DFB fiber laser

The theoretical basis and experimental realization of an all-fiber self-mixing laser Doppler velocimetry based on frequency-shifted feedback in a distributed feedback (DFB) fiber laser are presented, which employs a pair of fiber-coupled acousto-optic modulators to adjust the modulation intensity an...

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Bibliographic Details
Published in:Optics letters 2021-03, Vol.46 (6), p.1229-1232
Main Authors: Zhao, Yuanyang, Zhu, Desheng, Tu, Yourui, Pi, Lingling, Li, Hongtao, Xu, Lin, Hu, Zhijia, Shen, Yuecheng, Yu, Benli, Lu, Liang
Format: Article
Language:English
Subjects:
Acousto-optics
Acoustooptical devices
Fiber lasers
Laser doppler velocimeters
Lasers
Modulators
Optical feedback
Velocimetry
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Summary:The theoretical basis and experimental realization of an all-fiber self-mixing laser Doppler velocimetry based on frequency-shifted feedback in a distributed feedback (DFB) fiber laser are presented, which employs a pair of fiber-coupled acousto-optic modulators to adjust the modulation intensity and frequency of the laser self-mixing effect. Moreover, the minimum optical feedback intensity for the velocity signal successfully measured by the interferometer is 5.12 fW, corresponding to 0.16 photons per Doppler cycle. The results demonstrate that the proposed scheme can adapt to the non-contact measurement requirements of the wide-range speed and weak feedback level in the complex environment.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.418639