Luis Alberto Angurel

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Prof. Luis A. Angurel is Professor at the University of Zaragoza and researcher at the Laser for Energy and Advanced Materials research group in INMA. One of his main area of research is the use of laser technologies for the modification of material surface properties. From the point of view of material fabrication, he has been working in the development of 1) laser melting techniques to texture bulk High Temperature Superconductors and other ceramics with different cylindrical and planar geometries, and 2) laser ablation and surface modification methods. In the field of characterization, in the last years, his main area of research has been the development of thermal stability characterization techniques, using electrical measurements or optical ones based on the Digital Speckle Interferometry. In addition, he has been working in the development of applications. He coordinated a research project to develop 600A HTS current leads for the LHC at CERN, and he has been collaborating with different companies in the application of laser technologies in different sectors (ceramic, steel, watch or implant industries). He has published more than 100 papers in international journals, coordinated 15 research projects and he has been the supervisor or co-supervisor in 7 PhD theses related with superconductivity and laser material processing.

Application of ultra-short pulse lasers in material processing: from cultural heritage to high technological materials

Ultra-short laser pulse lasers open new opportunities in the development of material processing technologies. The adequate selection of the laser parameters allows an adequate control of the volume that has been affected by the laser. In addition, laser-surface interaction mechanisms generate a series of surface nanostructures that can be fitted to modify surface properties and develop new applications.

These ideas can be applied in very different materials that can be used in several application fields. In this talk several of these research lines are presented. Several lasers emitting pulses with pulse durations in the range of picoseconds and femtoseconds are being used. By one side, ablation processes have been used to develop new laser cleaning protocols that have been applied in the restauration of historical stained glasses and archeological materials. Laser protocols have been designed to minimize heat accumulation during the cleaning process. This has allowed the development of new laser cleaning processes that are not possible with the standard lasers that are frequently used in Cultural Heritage. On the other side, surface nanostructuring is also a possibility to modify surface properties and to improve the performance of several materials. This possibility has been applied to modify the surface superconducting properties of Nb samples or to modify optical or hydrophobic properties.

All these technologies have an additional advantage, they are green and respectful with environment, reducing the use of chemicals.