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handle: 20.500.14352/56203 , 10261/11290
[EN] A supercontinuum light source is a wideband source obtained as the result of the broadening of a spectrally narrow pump source in a nonlinear medium. Supercontinuum generation in optical fibers and waveguides has attracted considerable research interest in the last years, basically thanks to the development of special optical fibres with high nonlinear coefficient and tailored dispersion properties (namely photonic crystal fibers and tapered fibres) and the development of ultrashort laser technology. In this thesis, an extremely simple experimental method to generate a supercontinuum source with a continuous-wave pump and a suitable single-mode optical fibre is described. With this experimental configuration it is possible to obtain supercontinuum sources with a good stability and a high power spectral density. Starting from the basic knowledge of non linear effects that take place into the fibre, a theoretical explanation of the process that result in the supercontinuum source has been done. A mathematical simulation of all the process has also been developed. Applications of SC generation in optical fibres can now be found in fields such as Optical Communications, Optical Frequency Metrology, Spectroscopy and Optical Coherence Tomography. In this thesis, the viability of some of these applications is experimentally demonstrated.
[ES] Las fuentes de luz supercontinuas son fuentes de muy ancho espectro generadas a partir del bombeo de un material no lineal adecuado con un haz coherente, típicamente un láser pulsado. En los últimos años se ha incrementado notablemente el interés por este tipo de fuentes gracias a los desarrollos de nuevas fibras ópticas (fibras microestructuradas o de cristal fotónico y tapered) y al progreso en la tecnología de láseres ultracortos. Esta tesis describe un método experimental extremadamente simple para generar una fuente de luz supercontinua usando un láser de bombeo continuo y una fibra óptica monomodo con las características adecuadas. Se muestra que con esta configuración experimental pueden conseguirse fuentes supercontinuas con una buena estabilidad y valores de densidad espectral de potencia muy elevados. Partiendo de la consideración de los efectos no lineales que tienen lugar en la fibra, se aporta una explicación teórica de los procesos que conducen a la generación de la fuente supercontinua así como una simulación matemática de los mismos. El desarrollo de este tipo de fuentes resulta de gran interés para su aplicación en campos como las Comunicaciones Ópticas, la Metrología, la Espectroscopía y la Tomografía Óptica de Coherencia. En esta tesis se muestra experimentalmente la viabilidad de algunas de estas aplicaciones.
177 páginas.-- Tesis doctoral de la Facultad de Ciencias Físicas de la Universidad Complutense de Madrid (UCM) y del Laboratorio de Fibras Ópticas del Instituto de Física Aplicada del CSIC (IFA-CSIC).
Peer reviewed
Optical fibres, Fibras ópticas, Inestabilidad de modulación, Optical solitons, Óptica (Física), Solitones ópticos, Optica, Supercontinuum, Modulation instability, Supercontinuo, 2209.19 Óptica Física, Óptica
Optical fibres, Fibras ópticas, Inestabilidad de modulación, Optical solitons, Óptica (Física), Solitones ópticos, Optica, Supercontinuum, Modulation instability, Supercontinuo, 2209.19 Óptica Física, Óptica
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