Abstract
The variation of inhomogeneous and homogeneous line width with x for Sm 2+ ions in BaFCl x Br 1−x was studied by fluorescence line narrowing (FLN) and spectral hole-burning (HB). The ratios N of inhomogeneous width to homogeneous width approach maximum for x=0.8, 0.5 N is about 80 for transition from 7 F 0 to 5 D 2 of BaFCl 0.5 Br 1−x at 77 K. The inhomogeneous lines for transitions between 5 D J and 7 F 0 of Sm 2+ ions in BaFCl x Br 1−x (x=0.8, 0.5, 0.2) have novel double-peaked shape. According to the FLN study, these novel shapes are explained by different probabilities of Cl and Br ligand configurations around Sm 2+ . These novel shapes significantly broaden the inhomogeneous line width of Sm 2+ and make hole burning available at 77 K. This might have an important implication on frequency domain optical storage
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