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Ab initio studies on the optical effects in the deep ultraviolet nonlinear optical crystals of the KBe2BO3F2 family.

Authors
  • Kang, Lei1
  • Luo, Siyang
  • Huang, Hongwei
  • Zheng, Tao
  • Lin, Z S
  • Chen, C T
  • 1 Beijing Center for Crystal R&D, Key Lab of Functional Crystals and Laser Technology of Chinese Academy of Sciences, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. , (China)
Type
Published Article
Journal
Journal of Physics Condensed Matter
Publisher
IOP Publishing
Publication Date
Aug 22, 2012
Volume
24
Issue
33
Pages
335503–335503
Identifiers
DOI: 10.1088/0953-8984/24/33/335503
PMID: 22813626
Source
Medline
License
Unknown

Abstract

Electronic structures of the deep ultraviolet nonlinear optical crystals of the KBe(2)BO(3)F(2) (KBBF) family, including KBBF, RbBe(2)BO(3)F(2) and CsBe(2)BO(3)F(2), have been investigated based on a plane-wave pseudopotential method. Their linear and nonlinear optical coefficients are also calculated, and are in good agreement with the experimental results. A real-space atom-cutting method is adopted to analyze the respective contributions of the alkali metal cations and anionic groups to optical response. The results show that the contributions of anionic groups to the nonlinear optical anisotropic responses are dominant, but the influence of the A-site alkali metal cations becomes slightly more pronounced with the increase of their radius. Moreover, the birefringence difference among these crystals strongly depends on the volume effect, i.e., the spatial density of the (BO(3))(3-) anionic groups.

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