Longitudinal spatial characterisation of optical fibre erbium distributed feedback laser under the motion of steady magnetic field

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Abstract

The spatial sensitivity of an erbium doped optical fibre distributed feedback (DFB) laser to an external magnetic field is reported. Intrinsic birefringence of the laser cavity allows lasing in two orthogonal modes. The polarisation beat frequency between these modes is sensitive to magnetic fields aligned along the axis of the optical fibre due to the Faraday effect. The interaction of magnetic field, generated by a permanent magnet, with the spatial mode profile of the laser is investigated. Experimental measurements show a 3.82 MHz change in the beat frequency when a permanent magnet is scanned along the fibre laser.
Original languageEnglish
Title of host publication23rd International Conference on Optical Fibre Sensors
EditorsJosé Miguel López-Higuera, Julian Jones , Manuel López-Amo , José Luis Santos
Place of PublicationBellingham
Number of pages4
DOIs
Publication statusPublished - 2 Jun 2014
Event23rd International Conference on Optical Fibre Sensors - Santander, Spain
Duration: 2 Jun 20146 Jun 2014

Publication series

NameProceedings of the SPIE
PublisherSPIE
Volume9157
ISSN (Print)0277-786X

Conference

Conference23rd International Conference on Optical Fibre Sensors
CountrySpain
CitySantander
Period2/06/146/06/14

Keywords

  • fibre laser
  • magnetic filed sensor
  • faraday effect
  • spatial characterisation
  • optical fibre erbium
  • distributed feedback laser
  • steady magnetic field

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