Simulations of Pump Absorption in Tandem-Pumped Octagon Double-Clad Fibers

Grabner, Martin and Nithyanandan, Kanagaraj and Peterka, Pavel and et al, . (2021) Simulations of Pump Absorption in Tandem-Pumped Octagon Double-Clad Fibers. IEEE Photonics Journal, 13 (2). pp. 1-14. ISSN 1943-0647

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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 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 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. © 2009-2012 IEEE.

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IITH Creators:
IITH CreatorsORCiD
Nithyanandan, Kanagaraj
Item Type: Article
Additional Information: This work was supported by Czech Science Foundation through the Project 19-03141S. Corresponding author: Martin Grábner (e-mail:
Uncontrolled Keywords: Double-clad fiber; fiber laser; finite element beam propagation; pump absorption
Subjects: Physics
Divisions: Department of Physics
Depositing User: . LibTrainee 2021
Date Deposited: 26 Sep 2022 08:36
Last Modified: 26 Sep 2022 08:36
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