Persistent spectral hole burning studies of F2 color center in lithium fluoride

Optical hole burning studies in europium doped oxide glasses

“…However, hole width is more than that predicted by the lifetime of the levels, due to several other interactions that occur in the material at the microscopic level [1,6,14]. If the hole lasts for a long time (persistent spectral hole) then the material will retain the information for a long time [15,16]. Such materials are useful for long-term data storage.…”