Abstract
We demonstrated two methods of increasing the bandwidth of a broadband light source based on amplified spontaneous emission in thulium-doped fibres. Firstly, we have shown by means of a comprehensive numerical model that the full-width at half maximum of the thulium-doped fibre based broadband source can be more than doubled by using specially tailored spectral filter placed in front of the mirror in a double-pass configuration of the amplified spontaneous emission source. The broadening can be achieved with only a small expense of the output power. Secondly, we report results of the experimental thulium-doped fibre broadband source, including fibre characteristics and performance of the thulium-doped fibre in a ring laser setup. The spectrum broadening was achieved by balancing the backward amplified spontaneous emission with back-reflected forward emission.
Acknowledgements
The authors thank Simon Hutchinson for careful reading of the manuscripts and his helpful comments. The authors acknowledge the company SQS Fibre Optics, Czech Republic, for cooperation in the development of fused fibre components for the spectral region around 2 μm. The research was supported by the Agency for Healthcare Research of the Czech Republic, under project No. 15-33459A.
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© 2016 SEP, Warsaw
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- Coupled electric fields in photorefractive driven liquid crystal hybrid cells – theory and numerical simulation
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