Thulium-doped fiber performance optimization via fiber bending and twisting and inner-cladding shape design
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985882%3A_____%2F21%3A00555636" target="_blank" >RIV/67985882:_____/21:00555636 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1117/12.2592309" target="_blank" >https://doi.org/10.1117/12.2592309</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1117/12.2592309" target="_blank" >10.1117/12.2592309</a>
Alternative languages
Result language
angličtina
Original language name
Thulium-doped fiber performance optimization via fiber bending and twisting and inner-cladding shape design
Original language description
Thulium-doped fiber lasers have been extensively investigated as the most promising source of efficient laser emission at wavelengths around 2 μm, i. e., in the eye-safer spectral region and in the atmospheric window as well. It allows for wide range of applications including medicine, defense, distance measurement or materials processing. To enhance pump absorption efficiency along the active double-clad fiber, good overlap of the pump light and doped fiber core should be achieved along the fiber length. The overlap can be increased by breaking the circular symmetry of the inner cladding by shaping its cross-section. Further mode-mixing and better pump absorption can be achieved by coiling and twisting of double-clad fibers. In this work we present experimental measurement of 792 nm pump cladding absorption of a series of double-clad thulium-doped fibers with respect to their bend radius, the inner cladding cross-sectional shape and twist rate. With these fibers, we assembled a set of fiber lasers with different resonator setups and tested their performance. Twisting was introduced to fiber during drawing from an octagonal, CO2 laser-shaped or mechanically grinded preform so that the twist remained frozen in the drawn fiber. We have shown that the fiber twist significantly improves the pump absorption even in the case of straight or coiled fibers with large coil radii. We provide a preliminary comparison of two fiber laser resonators
Czech name
—
Czech description
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Classification
Type
D - Article in proceedings
CEP classification
—
OECD FORD branch
10306 - Optics (including laser optics and quantum optics)
Result continuities
Project
<a href="/en/project/GA19-03141S" target="_blank" >GA19-03141S: Research of novel geometries and layouts of double-clad rare-earth-doped fibers for high power fiber lasers</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
Proceedings of SPIE
ISBN
978-1-5106-4381-9
ISSN
0277-786X
e-ISSN
1996-756X
Number of pages
6
Pages from-to
117731A
Publisher name
SPIE
Place of publication
BELLINGHAM
Event location
Virtual, Online
Event date
Apr 19, 2021
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
000696183900029