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Origin of the generally defined absorption edge of non-stoichiometric lithium niobate crystals |
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| Authors: | Xiaochun Li Hongde Liu Jingjun Xu Ling Zhang Shiguo Liu |
| Affiliation: | a The Key Lab of Advanced Technique and Fabrication For Weak-Light Nonlinear Photonics Materials, Ministry of Education, Nankai University, Tianjin 300457, China b Tianjin Key Lab of Photonics Material and Technology for Information Science, Nankai University, Tianjin 300457, China |
| Abstract: | The ultraviolet absorption edges of LiNbO3 crystals with different Li2O contents and MgO doping concentrations were investigated. The generally defined absorption edges at absorption coefficient α=15 or 20 cm−1 of all these crystals fit the Urbach rule perfectly. The origin of this absorption edges in non-stoichiometric LiNbO3 crystals is attributed to the presence of Li vacancies. |
| Keywords: | 78.70.Dm 61.72.Ji |
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