To effectively remove cladding light in high power systems, cladding light strippers are used. We show that the stripping efficiency can be significantly improved by bending the fiber in such a device and present respective experimental data. Measurements were performed with respect to the numerical aperture as well, showing the dependency of the CLS efficiency on the NA of the cladding light and implying that efficiency data cannot reliably be given for a certain fiber in general without regard to the properties of the guided light.
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Till Walbaum, Andreas Liem, Thomas Schreiber, Ramona Eberhardt, Andreas Tünnermann, "Measurement and removal of cladding light in high power fiber systems," Proc. SPIE 10513, Components and Packaging for Laser Systems IV, 105130U (20 February 2018);