Development of Tm-Doped LMA Fibres for High-Power Amplifiers/Lasers Operating in the 2 um Spectral Range
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F25%3A00384648" target="_blank" >RIV/68407700:21340/25:00384648 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1109/CLEO/Europe-EQEC65582.2025.11109376" target="_blank" >https://doi.org/10.1109/CLEO/Europe-EQEC65582.2025.11109376</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1109/CLEO/Europe-EQEC65582.2025.11109376" target="_blank" >10.1109/CLEO/Europe-EQEC65582.2025.11109376</a>
Alternative languages
Result language
angličtina
Original language name
Development of Tm-Doped LMA Fibres for High-Power Amplifiers/Lasers Operating in the 2 um Spectral Range
Original language description
Large mode area thulium-doped fibres are essential for high-power fibre laser systems operating in the 2 μm range. They exhibit good quantum efficiency (> 1.9) when pumped by inexpensive semiconductor laser diodes operating at a wavelength of 790 nm, enabling energy-efficient high-power fibre lasers with output powers up to about 1 kW. Heat load, which easily achieves values of several W/cm is the limiting factor. Further power scaling is achievable through in-band pumping of thulium-doped, eventually holmium-doped fibre lasers/amplifiers. While in-band pumped lasers haven't yet reached their full potential, experiments are promising, with slope efficien-cies exceeding 88 % in 100 W, in-band pumped hybrid thulium-doped fibre laser, and 80 % in 35 Wall-fibre holmium-doped fibre laser. For efficient in-band pumping, diode-pumped thulium-doped fibre lasers operating at short wavelengths (1900–1950 nm) are advantageous due to their higher quantum efficiency compared to Raman fiber lasers. The heat load is distributed between the diode-pumped fibre lasers and a highly-efficient high-power in-band pumped laser/amplifier.
Czech name
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Czech description
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Classification
Type
O - Miscellaneous
CEP classification
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OECD FORD branch
10306 - Optics (including laser optics and quantum optics)
Result continuities
Project
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Continuities
S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů