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Title Modelling of Active Fibres
Author Frosz, Michael Henoch (Research Center COM, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Institution Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
Thesis level Master's thesis
Year 2003
Abstract Monte Carlo light propagation is examined in terms of the Wigner distribution function and the Wigner transport equation. Monte Carlo light propagation is then combined with a model for the interaction between light and a lasing medium. The combined model is used to calculate pump absorption in double-clad active fibres, and the results are compared with experimental measurements and other models. Good agreement is found with the experimental measurements in the case of a flattop input beam. In the case of a Gaussian input beam, qualitative agreement is found between the Monte Carlo simulations and a model based on the beam propagation method. It is also shown for the first time, to the best of the author's knowledge, that some qualitative information of the transverse intensity distribution in multimoded fibres can be obtained from Monte Carlo light propagation. It is found that the lasing model does not reach the steady-state solution, and suggestions for a correction is given.
Admin Creation date: 2006-06-22    Update date: 2007-02-24    Source: dtu    ID: 181104    Original MXD