J4 ›› 2015, Vol. 32 ›› Issue (4): 486-491.

• Basic Optics • Previous Articles     Next Articles

Longitudinal Spatial Response to Magnetic Field for a Faraday-rotation based Dual-Polarization Fiber Laser sensor

Yu Li, Cheng Linghao, Chen Zhenqiang, Liang Yizhi,Jin Long, Guan Bai-Ou   

  1. Institute of Photonics Technology, Jinan University, Guangzhou 510000,China
  • Received:2014-12-25 Revised:2015-01-23 Published:2015-07-28 Online:2015-08-04

Abstract:

Based on Faraday effect, miniature and agile magnetic field sensor has been demonstrated by using a dual-polarization fiber grating laser. To develop suitable package to optimize the sensitivity to magnetic field, it is desired to study the spatial response of a dual-polarization fiber grating laser to magnetic field. Experiment measurements for the longitudinal spatial response to magnetic field have been performed on a fiber grating laser with a length of 21 mm in magnetic fields of 0.5 T, 0.75 T and 1 T and field widths of 3 mm, 5 mm and 7 mm. It shows that the spatial response is not uniform along the longitudinal direction of the dual-polarization fiber grating laser. The spatial response peaks at the center of the laser cavity and shows as a symmetric Gaussian distribution along the longitudinal direction of the laser. Such distribution characteristic of the spatial response is related to the distributed Bragg reflecting.

Key words: laser physics, fiber-optical sensors, Faraday effect, magnetic field sensors, fiber grating lasers

CLC Number: