Phase noise influence in dual-frequency laser phase-shift range finder

Hongzhi Yang; Changming Zhao; Haiyang Zhang; Suhui Yang

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Phase noise influence in dual-frequency laser phase-shift range finder

Hongzhi Yang,Changming Zhao,Haiyang Zhang * #,Suhui Yang

School of Optoelectronics，Beijing Institute of Technology，Beijing，100081, China

*Correspondence author

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Funding: none

Opened online:10 May 2017

Accepted by: none

Citation: Hongzhi Yang,Changming Zhao,Haiyang Zhang.Phase noise influence in dual-frequency laser phase-shift range finder[OL]. [10 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4730206

The influence of phase noise in dual-frequency laser phase-shift range finder is theoretical and experimentally investigated. The proposed range finder is based on the use of a coherent dual-frequency laser and a direct detection of the backscattered laser. The effects of laser phase noise and noise from an acousto-optic frequency shifter (AOFS) on dual-frequency laser phase-shift range finder is analyzed. The expression of power spectral density and the phase noise of dual-frequency laser beat note are deduced. And we find that noise from the acousto-optic frequency shifter exhibit much greater impact into beat note noise conversion. The theoretical results can be used to estimate the influence of laser phase noise, noise induced by the acousto-optic frequency shifter and delay length in dual-frequency laser range finder. The experiment of dual-frequency laser range finder is performed on outdoor targets at the distance of 200m. The phase jitter in the experiment is in good agreement with the model of beat note phase noise.

Keywords:Phase noise; Dual-frequency laser phase-shift range finder; Acousto-optic frequency shifter; Power spectral density; Phase jitter

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