Laser-processing the inner surfaces of 15 m long vacuum pipes installed in the LHC aims to create a nanostructured functional surface with low Secondary Electron Yield (SEY). The experimental system to treat the vacuum pipes in-situ, including a 532 nm picosecond-laser, a 15 m long optical fiber, and an inchworm robot, will be presented. The laser-induced generation of micro- and nanostructures reduces the SEY of the surface. To optimize the surface treatment, the processing parameters were varied, and different scanning patterns applied. The variation in ablation depth, surface topography and composition correlate well with changes of the SEY.
We explore different approaches to achieve co-doping of glasses with rare earth ions and metallic nanoparticles, and to
manipulate the spectral position of the particles' surface plasmon resonance. The final goal is to find a composite
material with improved efficiency of frequency up-conversion of light for photovoltaic applications. The potential for
improvement has been shown by theoretical calculations predicting that absorption and emission probabilities of the ions
can be enhanced when the plasmon resonance of the nanoparticles is close to the respective transition frequency of the
ions. In this work we demonstrate the sequential co-doping of glasses already containing rare-earth ions with Ag
nanoparticles, as well as implantation of rare-earth ions in glasses which already contained metallic nanoparticles. It
could also be demonstrated that the surface plasmon resonance of the created particles can be tuned by femtosecond
laser induced shape transformation of the Ag clusters.
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