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Numerical modelling of pump absorption in coiled and twisted double-clad fiber: a prospect for tandem pumped fiber laser
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SYSNO ASEP 0540936 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Numerical modelling of pump absorption in coiled and twisted double-clad fiber: a prospect for tandem pumped fiber laser Author(s) Grábner, Martin (URE-Y)
Nithyanandan, K. (IN)
Peterka, Pavel (URE-Y) RID
Koška, Pavel (URE-Y)
Honzátko, Pavel (URE-Y) RID
Jasim, Ali (URE-Y)Number of authors 6 Article number 113550W Source Title Proceedings of SPIE, Micro-Structured and Specialty Optical Fibres VI, 11355. - BELLINGHAM : SPIE, 2020 / Kalli K ; Bunge CA - ISSN 0277-786X - ISBN 978-1-5106-3483-1 Number of pages 6 s. Publication form Print - P Action Micro-Structured and Specialty Optical Fibres VI Event date 06.04.2020 - 10.04.2020 VEvent location None Country FR - France Event type WRD Language eng - English Country US - United States Keywords Double clad fiber ; Fiber laser ; Finite element beam propagation ; Pump absorption 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 UT WOS 000576761300021 EID SCOPUS 85085176476 DOI 10.1117/12.2557230 Annotation The high-power operation of fiber lasers was enabled mainly by the invention of cladding pumping within a double-clad fiber structure. Various cross-sectional shapes of double-clad fibers as well as unconventional coiling methods have been investigated both experimentally and theoretically in order to enhance the absorption of the multimode-pump. With enhanced pump absorption efficiency, the double-clad fiber of shorter length can be used in the fiber devices and in such a way the unwanted effects of background losses and nonlinear effects can be mitigated. In this paper we report on numerical modelling of optical pump absorption in double-clad octagonal active fiber of different fiber geometry and layouts. Namely we investigate the effect of the bending radii, twist rate of the fiber, doped core area (holmium is considered in this as a doping ion) and pump beam shape. The numerical model is based on FEM-BPM method. The optimized geometries and layouts shall finally result in a highly efficient laser of small footprint without the need of water cooling with great potential for application with low power consumption, tightly limited space and weight requirements. Optimized design will also minimize risk of damage of the fiber during operation of the fiber laser 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 2021 Electronic address https://doi.org/10.1117/12.2557230
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