Enhanced pump absorption efficiency in coiled and twisted double-clad thulium-doped fibers

0460233 - ÚFE 2017 RIV US eng J - Journal Article
Koška, Pavel - Peterka, Pavel - Aubrecht, Jan - Podrazký, Ondřej - Todorov, Filip - Becker, M. - Baravets, Yauhen - Honzátko, Pavel - Kašík, Ivan
Enhanced pump absorption efficiency in coiled and twisted double-clad thulium-doped fibers.
Optics Express. Roč. 24, č. 1 (2016), s. 102-107. ISSN 1094-4087
R&D Projects: GA TA ČR(CZ) TH01010997; GA MŠMT(CZ) LD15122
Institutional support: RVO:67985882
Keywords : Thulium-doped fibers * Fiber lasers * Double clad fibers
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 3.307, year: 2016

Results of the first experimental demonstration of the recently proposed technique for improvement of the pump absorption in double-clad fibers by their simultaneous coiling and twisting are reported. The peak absorption (14 dB) of 3-m long hexagonal thulium-doped fiber was increased by 8 dB by its simultaneous coiling and twisting. Explanation of the effect is given by numerical modelling of the pump absorption in hexagonal and panda-type double-clad fibers. Improvement of fiber laser performance was also proved. The slope efficiency increased from 19.6% of the straight fiber to 23.9% of the coiled only fiber and 29.4% of the simultaneously coiled and twisted fiber
Permanent Link: http://hdl.handle.net/11104/0260360