Sensitivity enhancement of Faraday effect based heterodyning fiber laser magnetic field sensor by lowering linear birefringence | Zendy

Linghao Cheng | Zendy; Jianlei Han | Zendy; Long Jin | Zendy; Zhenzhen Guo | Zendy; BaiOu Guan | Zendy

Open Access

Sensitivity enhancement of Faraday effect based heterodyning fiber laser magnetic field sensor by lowering linear birefringence

Author(s) -

Linghao Cheng,

Jianlei Han,

Long Jin,

Zhenzhen Guo,

BaiOu Guan

Publication year - 2013

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.21.030156

Subject(s) - birefringence , optics , materials science , faraday effect , laser , fiber laser , sensitivity (control systems) , faraday cage , polarization maintaining optical fiber , fiber optic sensor , magnetic field , optical fiber , optoelectronics , physics , quantum mechanics , electronic engineering , engineering

In this paper, we demonstrate that the sensitivity of Faraday effect based heterodyning fiber laser sensors for magnetic field can be effectively enhanced by lowering the intrinsic linear birefringence inside the fiber laser cavity. Well explained by theoretical analysis and confirmed by birefringence tuning through transversal force, it shows that the sensitivity to magnetic field intensity is inversely proportional to the linear birefringence. A CO(2)-laser treatment is therefore proposed to tune the intra-cavity linear birefringence. With CO(2)-laser treatment, the intra-cavity linear birefringence can be lowered permanently to effectively enhance the sensitivity of a heterodyning fiber laser sensor to magnetic field.

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