We report on the first high-resolution study of LiLuF4:Tm3+.The accurate energy level scheme of Tm3+ in the LiLuF4 matrix was obtained for the 3H6,5,4,3F4,3,2,and 1G4 multiplets.It was shown that electric-dipole transitions dominate for all the studied multiplets except the 3H5 one.
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