Femtosecond Laser Micromachining of Fabry-Pérot Interferometers for Magnetic Field Sensing João M. Maia, Vítor A. Amorim, Duarte Viveiros and P. V. S. Marques EPJ Web Conf., 215 (2019) 13001 Published online: 10 September 2019 DOI: 10.1051/epjconf/201921513001