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High-Power Single-Frequency Thulium-Doped Fiber DBR Laser at 1943 nm

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5 Author(s)
Z. Zhang ; Physics Department, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK ; A. J. Boyland ; J. K. Sahu ; W. A. Clarkson
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We report on a high-power single-frequency mode-hop-free fiber distributed Bragg reflector (DBR) laser fabricated from Tm-doped photosensitive alumino-silicate fiber and in-band pumped by an Er/Yb fiber laser at 1565 nm. The fiber DBR laser yielded up to 580 mW of single-frequency single-ended output at 1943 nm for ~ 5 W of absorbed pump power. Further scaling of the DBR laser output power was achieved with the aid of a simple Tm-doped fiber amplifier stage spliced directly to the DBR fiber without the need of an optical isolator. The maximum output power from the DBR laser and fiber amplifier was 2.9 W for a combined absorbed pump power of 9 W. The merits of this DBR laser architecture compared to conventional DBR and distributed-feedback laser configurations are discussed.

Published in:

IEEE Photonics Technology Letters  (Volume:23 ,  Issue: 7 )