Spectral hole burning acting as a high resolution spectroscopic technique has potential applications on high density optical storage. The present paper report the research results on inhomogeneous broadening

fluorescence line narrowing

high temperature persistent spectral hole burning

mechanism of hole burning

hole burning dynamics and thermal stability of spectral holes. We designed and prepared new material system of divalent samarium ion doped alkaline earth metal fluoride halides for high temperature hole burning. Room temperature hole burning and spectral hole with longer lifetime were performed. Various local configurations were distinguished by using time resolved spectroscopy. Spectral redistribution induced by hole burning indicates that trivalent samarium ions act as electron traps. Hole burning dynamics was analyzesed by using Block theory.