26 February 2018 Pump absorption in coiled and twisted double-clad hexagonal fiber: effect of launching conditions and core location
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Proceedings Volume 10512, Fiber Lasers XV: Technology and Systems; 105122P (2018) https://doi.org/10.1117/12.2286613
Event: SPIE LASE, 2018, San Francisco, California, United States
Abstract
Ever 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.
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Romain Dalidet, Romain Dalidet, Pavel Peterka, Pavel Peterka, Valérie Doya, Valérie Doya, Jan Aubrecht, Jan Aubrecht, Pavel Koška, Pavel Koška, } "Pump absorption in coiled and twisted double-clad hexagonal fiber: effect of launching conditions and core location", Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 105122P (26 February 2018); doi: 10.1117/12.2286613; https://doi.org/10.1117/12.2286613
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