Fiber Bragg grating fabrication by femtosecond laser radiation Anton Chernikov, Dmitriy Kochuev, Kirill Khorkov, Ruslan Chkalov and Nikolay Davydov EPJ Web Conf., 220 (2019) 03007 Published online: 25 October 2019 DOI: 10.1051/epjconf/201922003007