A fast algorithm to predict spectral broadening in CW bidirectionally pumped high-power Yb-doped fiber lasers

A detailed, fast-converging iterative numerical method has been developed to model continuous-wave bidirectionally pumped Yb-doped fiber lasers with output powers of several hundred watts. The analysis shows nonlinearity-induced broadening of the lasing spectrum, which also modifies power efficiency...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2015-11, Vol.121 (2), p.179-185
Main Authors: Szabó, Áron, Várallyay, Zoltán, Rosales-Garcia, Andrea, Headley, Clifford
Format: Article
Language:English
Subjects:
Engineering
Lasers
Optical Devices
Optics
Photonics
Physical Chemistry
Physics
Physics and Astronomy
Quantum Optics
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Summary:A detailed, fast-converging iterative numerical method has been developed to model continuous-wave bidirectionally pumped Yb-doped fiber lasers with output powers of several hundred watts. The analysis shows nonlinearity-induced broadening of the lasing spectrum, which also modifies power efficiency. Cavity dynamics is described by combining the effects of Kerr nonlinearities with power evolution equations and rate equations. The fast method to find steady-state solutions for cavity setups is based on setting the temporal phase evolution as a stochastic process with proper spectral filtering. Spectral properties of bidirectionally pumped lasers are calculated within few minutes using a commercial desktop computer, and very good agreement with experimental measurements is obtained for up to 922 W total pump and 708 W output power.
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-015-6215-9