UV, visible and IR active media based on scheelite-type and colquiriite-type fluoride crystalsVadim Semashko, Alexander Naumov, Alexey Nizamutdinov, Stella Korableva, Michail Marisov and Alexey ShavelevEPJ Web Conf., 220 (2019) 01011DOI: https://doi.org/10.1051/epjconf/201922001011