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Enhanced pump absorption efficiency in coiled and twisted double-clad fibers for fiber lasers
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SYSNO ASEP 0519192 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Enhanced pump absorption efficiency in coiled and twisted double-clad fibers for fiber lasers Author(s) Peterka, Pavel (URE-Y) RID
Koška, Pavel (URE-Y)
Jasim, Ali (URE-Y)
Kanagaraj, Nithyanandan (URE-Y)
Aubrecht, Jan (URE-Y) RID
Kamrádek, Michal (URE-Y)
Podrazký, Ondřej (URE-Y) RID
Todorov, Filip (URE-Y)
Kašík, Ivan (URE-Y) RID
Honzátko, Pavel (URE-Y) RIDNumber of authors 10 Article number Th.B6.1 Source Title 21st International Conference on Transparent Optical Networks, ICTON 2019. - Varšava : IEEE, 2019 / Jaworski M. ; Marciniak M. - ISSN 2162-7339 - ISBN 978-1-7281-2779-8 Number of pages 4 s. Publication form Print - P Action 21st International Conference on Transparent Optical Networks, ICTON 2019 Event date 09.07.2019 - 13.07.2019 VEvent location Angers Country FR - France Event type WRD Language eng - English Country PL - Poland Keywords Optical pumping ; Rare-earth-doped fibers ; Thulium-doped fibers Subject RIV BH - Optics, Masers, Lasers OECD category Optics (including laser optics and quantum optics) R&D Projects GA19-03141S GA ČR - Czech Science Foundation (CSF) Institutional support URE-Y - RVO:67985882 EID SCOPUS 85073075373 DOI 10.1109/ICTON.2019.8840274 Annotation High-power operation of fiber lasers was mainly enabled by the invention of cladding-pumping in a double-clad fiber structure. Pump absorption is enhanced by broken circular symmetry of inner cladding cross-sections and by mode-scrambling of the pump modes resulting from unconventional fiber coiling. However, theoretical studies were limited to the assumption of a straight fiber until recently, when the rigorous model accounting for double-clad fiber bending and twisting was described. It was found that squeezing of the effective area of the pump radiation due to fiber bending plays an important role in cladding-pump absorption enhancement. We review results of numerical modeling of pump absorption in various types of double-clad fibers, e.g., with cross-section shape of hexagon, stadium, and circle, two-fiber bundle (so-called GTWave fiber structure) a panda fibers are also analyzed. The presented results can have a practical application and potential impact in the construction of fiber lasers: with pump absorption efficiency optimized by our new model (the other models did not take into account fiber twist), the double-clad fiber of shorter length can be used in the fiber lasers and amplifiers. This dramatically minimizes the deleterious effect of background losses and nonlinear effects Workplace Institute of Radio Engineering and Electronics Contact Petr Vacek, vacek@ufe.cz, Tel.: 266 773 413, 266 773 438, 266 773 488 Year of Publishing 2020
Number of the records: 1