The cladding pumping within a double-clad fiber structure is an effective technique to convert high-power multimode beam into high-power, almost diffraction limited beam.Since the pump efficiency is limited by the presence of higher skew-ray modes, geometrical perturbations are used to scramble the modes and to achieve a higher overlap of RAW ORG PROTEIN CHOCOLATE the electromagnetic field with the doped core.In this paper, the combined effect of fiber coiling and twisting is investigated in the double-clad fiber structure with the octagonal shape of an inner cladding.
Electromagnetic field propagation through fibers with different cross-section areas, bending radii and twisting rates is numerically simulated using finite element beam propagation method.Holmium-doped double-clad fiber pumped in tandem configuration at wavelength 1950 nm is selected as an example.Nontrivial dependence Ball - Glove Softball Catcher - Junior of pump absorption on bending radius with the presence of local maxima is revealed.
The observed impact of fiber coiling and twisting increases with the size of the cross-section area of the inner cladding.