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Resumen:
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Solid state dye lasers (SSDL) provide low-cost gain media with tuneable and e-cient emission across the whole visible spectrum and beyond, which together with their processing and pumping exibility, makes them very attractive for the fabrication and development of cost-eective laser heads for biomedical applications or coherent light sources suitable for integration in optoelectronic, spectroscopic or sensing devices. One signicant challenge is to address the limited operational lifetime (photostability) of these devices due to dye photodegradation, to enable use of these sources in the aforementioned applications. In this thesis report, the problem of the optimization and characterization of both the eciency and photostability of SSDL as laser rods and colloidal suspensions, as well as thin lms (integrated devices) is tackled. Two dierent, but complementary, experimental approaches have been followed in order to achieve this goal: a \chemical" approach, consisting of choosing or synthesizing the most adequate host matrix for a given dye with the aim to improve the dye/host compatibility, and a \physical" approach, consisting of tailoring the emission properties of the active medium by means of optical scattering induced by structural modications at the nanoscale. The thesis report comprises theoretical, numerical and experimental results, with a clear prevalence of the later.
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