Pump absorption in coiled and twisted double-clad hexagonal fiber: effect of launching conditions and core location

0500237 - ÚFE 2019 RIV US eng C - Conference Paper (international conference)
Dalidet, R. - Peterka, Pavel - Doya, V. - Aubrecht, Jan - Koška, Pavel
Pump absorption in coiled and twisted double-clad hexagonal fiber: effect of launching conditions and core location.
Fiber Lasers XV: Technology and Systems, Proceedings of SPIE. Vol. 10512. Bellingham: SPIE, 2018 - (Hartl, I.; Carter, A.), č. článku 105122P. ISBN 978-151061509-0. ISSN 0277-786X. E-ISSN 1996-756X.
[Fiber Lasers XV: Technology and Systems. San Francisco (US), 29.01.2018-01.02.2018]
R&D Projects: GA TA ČR TH01010997; GA MŠMT(CZ) LD15122
Grant - others:COST ACTION(XE) MP1401- AFLASER
Institutional support: RVO:67985882
Keywords : fiber design and fabrication * fiber lasers * optical pumping
OECD category: Electrical and electronic engineering

ver extending applications of fiber lasers require energy efficient, high-power, small footprint and reliable fiber lasers and laser wavelength versatility. To meet these demands, next generation of active fibers for high-power fiber lasers is coming out that will eventually offer tailored spectroscopic properties, high robustness and reduced cooling requirements and improved efficiency through tailored pump absorption. We report on numerical modelling of the efficiency of the pump absorption in double clad active fibers with hexagonal shape of the inner cladding cross section and rare-earth doped core. We analyze both the effect of different radii of the spool on which the fiber is coiled and different fiber twisting rates. Two different launching conditions were investigated: the Gaussian input pump beam and a speckle pattern that mimics the output of the pump laser diode pigtail. We have found that by asymmetric position of the rare-earth-doped core we can significantly improve the pump absorption
Permanent Link: http://hdl.handle.net/11104/0292341