Ultrasound detection using a tunable low beat-frequency Er3+-doped DBR fiber laser

Tuan Guo, Allan Chi Lun Wong, Weisheng Liu, Baiou Guan, Chao Lu, Hwa Yaw Tam

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)

Abstract

A compact low-beat-frequency dual-polarization distributed Bragg reflector (DBR) fiber laser for high-frequency ultrasound detection has been demonstrated. The laser was fabricated in high germanium concentration, small-core erbium-doped fiber with very small birefringence. Induced birefringence to the fiber during the UV inscription process is small (∼10-7) because of the small fiber core (4.2-μm) and consequently the laser beats at a low frequency of ∼20 MHz, making frequency down-conversion unnecessary. The beat frequency can be adjusted by controlling the side-exposure time of the UV light irradiating the gain cavity, providing a simple approach to multiplex a large number of DBR fiber lasers of different frequencies in series using frequency division multiplexing (FDM) technique.
Original languageEnglish
Title of host publication21st International Conference on Optical Fiber Sensors
Volume7753
DOIs
Publication statusPublished - 9 Jun 2011
Event21st International Conference on Optical Fiber Sensors - Ottawa, ON, Canada
Duration: 15 May 201119 May 2011

Conference

Conference21st International Conference on Optical Fiber Sensors
Country/TerritoryCanada
CityOttawa, ON
Period15/05/1119/05/11

Keywords

  • DBR fiber laser
  • ultrasound detection

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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