1. Department of Metallurgical Engineering, Faculty of Engineering, University of Santiago Chile, Av. Lib. Bernardo O’Higgins 3363, Estación Central, 9170022 Santiago, Chile
2. Department of Physics, Faculty of Science, University of Santiago Chile, Avenida Ecuador 3493, Estación Central, 9170124 Santiago, Chile
3. Millennium Institute for Research in Optics (MIRO), Av. Esteban Iturra S/N, Concepción, 4030000 Concepción, Chile