Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, Campus da Caparica, Portugal
Sala 107 - Edifício IV e Online https://videoconf-colibri.zoom.us/j/344521416?pwd=WVdzSFQ4cXdJT2oyMzdITjlLaDN6Zz09
22 de Novembro de 2023 às 14h
Production of different laser beam profiles and their applications
Mestre Miguel Catela
Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, Portugal
Aside from the industry-standard Gaussian intensity profile, top hat and non-conventional laser beam shapes, such as doughnut-shaped profile, are ever more required. The top hat laser beam profile is well-known for uniformly irradiate the target material, significantly reducing the heat affected zones, typical of Gaussian laser irradiation, whereas the doughnut-shaped laser beam has attracted much interest for its use in trapping particles at nanoscale. Furthermore, the annular thermal profile is significantly important when temperature is the leading factor, specifically, in laser heat treatment and laser hardening. However, generating these profiles rises the system cost and complexity, while its output power is significantly reduced. Solar-pumped lasers can be a cost-effective and more sustainable alternative to accomplish these useful laser beam distributions. Even though doughnut-shaped solar laser beams were experimentally obtained, their production methods were not fully exploited. Hence, the first numerical simulation of doughnut-shaped and top hat solar laser beam profiles reported here significantly contributes to understand how to generate such beams, particularly the top hat solar laser beam that was not yet demonstrated in practical essays.
Miguel Catela Bio:
Miguel Catela studied Biomedical Engineering at the School of Science and Technology of the New University of Lisbon. He has been collaborating with the solar laser laboratory since his Master's thesis, during which he developed a solar laser prototype for medical applications. In 2020, he received a PhD fellowship grant from the Portuguese Foundation for Science and Technology (FCT) and has since focused his research on enhancing solar laser technology in terms of efficiency, stability, and the extraction of various laser beam profiles.