Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5367658 | Applied Surface Science | 2011 | 4 Pages |
We report experimental observation of ultra-long lifetime UV-induced absorption in undoped and 5Â mol.% Mg-doped congruent lithium niobate crystals between 400Â nm and 2500Â nm wavelength range. The saturated absorption coefficient change in undoped congruent lithium niobate was about 3 to 7 times that in Mg-doped congruent lithium niobate in the mid-infrared spectrum. The UV-illuminated LiNbO3:Mg was fully recovered in the dark after 2 days, whereas the undoped congruent LiNbO3 still exhibited nontrivial infrared absorption. We attribute the cause of the UV-induced absorption to the creation of hole-trapped intermediate states Oâ near lithium vacancies.
Research highlights⺠Observation of ultra-long lifetime UV-induced IR absorption in LiNbO3 and LiNbO3:Mg was reported. ⺠The saturated absorption coefficient change in undoped CLN was higher than that in CLN:Mg. ⺠UV-illuminated LiNbO3:Mg was fully recovered before undoped LiNbO3 in the dark after 2 days. ⺠UV-induced absorption was due to creation of hole-trapped intermediate states Oâ near Li vacancies.