Study of the defect in the CaF2 materials via a laser-induced fluorescence measurement Mariem Guesmi, Tomaš Thoř, František Procháska, Oumayma Taboubi, Ivana Šeděnková and Karel Žídek EPJ Web Conf., 309 (2024) 06021 Published online: 31 October 2024 DOI: 10.1051/epjconf/202430906021