Monolithic narrow linewidth polarization-maintaining thulium fiber laser using femtosecond laser written fiber Bragg gratings

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

doi:10.1117/12.885989

25 May 2011 Monolithic narrow linewidth polarization-maintaining thulium fiber laser using femtosecond laser written fiber Bragg gratings

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

Author Affiliations +

Proceedings Volume 8039, Laser Technology for Defense and Security VII; 80390H (2011) https://doi.org/10.1117/12.885989
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

Abstract

We have demonstrated an all-fiber thulium laser system that, without any intracavity polarizing elements or freespace components, yielded a stable polarization extinction ratio (PER) of ~18 dB. The system is based on singlemode polarization-maintaining silica fiber and its cavity is formed from each a high and low reflectivity femtosecond laser written fiber Bragg grating resonant at 2054 nm. The output of the fiber is not only highly polarized, but maintains a narrow linewidth of 78 pm at its maximum output power of 5.24 W. The high PER without any polarizing elements in the cavity is of great interest and makes the systems useful for spectral beam combining and other applications which require polarization dependent optical 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, and Stefan Nolte "Monolithic narrow linewidth polarization-maintaining thulium fiber laser using femtosecond laser written fiber Bragg gratings", Proc. SPIE 8039, Laser Technology for Defense and Security VII, 80390H (25 May 2011); https://doi.org/10.1117/12.885989

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