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

doi:10.1117/12.884973

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

The Hong Kong Polytechnic University

Research output: Chapter in book / Conference proceeding › Conference article published in proceeding or book › Academic research › peer-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 language	English
Title of host publication	21st International Conference on Optical Fiber Sensors
Volume	7753
DOIs	https://doi.org/10.1117/12.884973
Publication status	Published - 9 Jun 2011
Event	21st International Conference on Optical Fiber Sensors - Ottawa, ON, Canada Duration: 15 May 2011 → 19 May 2011

Conference

Conference	21st International Conference on Optical Fiber Sensors
Country/Territory	Canada
City	Ottawa, ON
Period	15/05/11 → 19/05/11

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

More information

10.1117/12.884973

Cite this

@inproceedings{dece237acd6c495c94d952179a37a866,

title = "Ultrasound detection using a tunable low beat-frequency Er3+-doped DBR fiber laser",

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.",

keywords = "DBR fiber laser, ultrasound detection",

author = "Tuan Guo and Wong, {Allan Chi Lun} and Weisheng Liu and Baiou Guan and Chao Lu and Tam, {Hwa Yaw}",

year = "2011",

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doi = "10.1117/12.884973",

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AU - Guo, Tuan

AU - Wong, Allan Chi Lun

AU - Liu, Weisheng

AU - Guan, Baiou

AU - Lu, Chao

AU - Tam, Hwa Yaw

PY - 2011/6/9

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N2 - 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.

AB - 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.

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BT - 21st International Conference on Optical Fiber Sensors

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