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1 Bulletin of the Polish Academy of Sciences. Technical Sciences

1 2019

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Thulium-doped optical fibers for fiber lasers operating at around 2 μm

Kasik I., Kamradek M., Aubrecht J., Peterka P., Podrazky O., Cajzl J., Mrazek J., Honzatko P.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2019

Vol. 67, nr 5

981--986

The paper deals with spectral and lasing characteristics of thulium-doped optical fibers fabricated by means of two doping techniques, i.e. via a conventional solution-doping method and via a nanoparticle-doping method. The difference in fabrication was the application of a suspension of aluminum oxide nanoparticles of defined size instead of a conventional chloride-containing solution. Samples of thulium-doped silica fibers having nearly identical chemical composition and wave guiding properties were fabricated. The sample fabricated by means of the nanoparticle-doping method exhibited longer lifetime, reflecting other observations and the trend already observed with the fibers doped with erbium and aluminum nanoparticles. The fiber fabricated by means of the nanoparticle-doping method exhibited a lower lasing threshold (by »20%) and higher slope efficiency (by »5% rel.). All these observed differences are not extensive and deserve more in-depth research; they may imply a positive influence of the nanoparticle approach on properties of rare-earth-doped fibers for fiber lasers.