Amplificateur à fibre double gaine codopée à l'erbium et l'ytterbium : modélisation et vérification expérimentale
|Abstract:||The main purpose of this project is to predict the behaviour of a high power double cladding erbium/ytterbium fibre amplifier in continuous wave operation using a simulation tool. A software simulating the amplification of light in a doped optical fibre has been developed and implemented numerically using the C++ computer language. This general model is suitable for any amplifier or laser scheme with a given active ion. The doped fibres used in the project have been characterized experimentally to determine the input parameters for the simulation. Experiments have also been conducted to measure the performance of such doped fibres in laser and amplifier configurations. We subsequently focus on comparing experiments and simulations. We first validate our software with results from scientific papers and with experimental data for the simple case of an ytterbium doped fibre laser. A simulation model is then developed for an erbium/ytterbium system using a simple energy level scheme reducing the number of parameters to adjust. The transfer rate between ytterbium and erbium atoms is fitted using experiments, which results in an excellent agreement between simulations and experiments. The resulting simulation software is then able to predict experimentally the performance of a high power double clad erbium/ytterbium amplifier in different configuration schemes. A new fact arises from our investigation: the emission cross-section of ytterbium in an erbium/ytterbium codoped fibre happens to be much smaller than that predicted by the McCumber theory.|
|Document Type:||Mémoire de maîtrise|
|Open Access Date:||12 April 2018|
|Collection:||Thèses et mémoires|
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