materials Article Laser-Induced Breakdown Spectroscopy (LIBS) for Monitoring the Formation of Hydroxyapatite Porous Layers Daniel Sola 1,*, Daniel Paulés 2, Lorena Grima 3 and Jesús Anzano 2 ID 1 Laboratorio de Óptica, Centro de Investigación en Óptica y Nanofísica, Universidad de Murcia,...