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  • CLEO/Europe and EQEC 2011 Conference Digest
  • OSA Technical Digest (CD) (Optica Publishing Group, 2011),
  • paper CE_P17

Study on UV absorption edge of MgO doped LiNbO3 and CTVE excitons

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Abstract

Lithium niobate (LiNbO3) is an important synthetic crystal because of its good electro-optic, acousto-optic, elasto-optic, piezoelectric, pyroelectric, and nonlinear optic properties. Photorefraction is one of its most important properties since this effect can be utilized in holographic storage, laser physics, and information processing, although it hinders the usage of LiNbO3 as a frequency doubler, optical parametric oscillator, and Q-switch. It is found that a certain amount of MgO doped into LiNbO3 will suppress the optical damage in the visible, however it will significantly enhance the photorefractivity of LiNbO3 in the ultraviolet (UV) [1]. For years, people find it difficult to explain this unusual photorefraction enhancement in the UV because of the valence stability of the element Mg. Recently, Vikhnin et al. demonstrated theoretically and experimentally an exciton structure named charge transfer vibronic excitons (CTVE) in ABO3-type ferroelectric oxides [2]. They believed that the CTVE is composed of a well-correlated pair of electronic and hole polarons with its energy level located just above the top of the valence band.

© 2011 Optical Society of America

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