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

17 May 2011 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

Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 775336 (2011) https://doi.org/10.1117/12.884973
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

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.

Citation Download Citation

Tuan Guo, Allan Chi-lun Wong, Weisheng Liu, Baiou Guan, Chao Lu, and Hwa-Yaw Tam "Ultrasound detection using a tunable low beat-frequency Er³⁺-doped DBR fiber laser", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 775336 (17 May 2011); https://doi.org/10.1117/12.884973

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