10 February 2011 All-fiber single-mode PM thulium fiber lasers using femtosecond laser written fiber Bragg gratings
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Abstract
A polarization-maintaining (PM), narrow-linewidth, continuous wave, thulium fiber laser is demonstrated. The laser cavity is formed from two femtosecond-laser-written fiber Bragg gratings (FBGs) and operates at 2054 nm. The laser output possesses both narrow spectral width (78 pm) and a high polarization extinction ratio of ~18 dB at 5.24 W of output power. This laser is a unique demonstration of a PM thulium fiber system based on a two FBG cavity that produces high PER without any free-space elements. Such a narrow linewidth source will be useful for applications such as spectral beam combining which often employ polarization dependent combining elements.
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Christina C. C. Willis, Joshua D. Bradford, R. Andrew Sims, Lawrence Shah, Martin Richardson, Jens Thomas, Ria G. Becker, Christian Voigtländer, Andreas Tünnermann, Stefan Nolte, "All-fiber single-mode PM thulium fiber lasers using femtosecond laser written fiber Bragg gratings", Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79140I (10 February 2011); doi: 10.1117/12.877795; https://doi.org/10.1117/12.877795
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