High electro-optic kerr effect in (Bi,K,Na)TiO<sub>3</sub> relaxor single crystals

  • TAKEDA Kotaro
    Graduate School of Science and Technology, Tokyo Institute of Technology
  • HOSHINA Takuya
    Graduate School of Science and Technology, Tokyo Institute of Technology
  • TAKEDA Hiroaki
    Graduate School of Science and Technology, Tokyo Institute of Technology
  • NOGUCHI Yuji
    Research Center for Advanced Science and Technology, The University of Tokyo
  • MIYAYAMA Masaru
    Research Center for Advanced Science and Technology, The University of Tokyo
  • TSURUMI Takaaki
    Graduate School of Science and Technology, Tokyo Institute of Technology

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  • High electro-optic kerr effect in (Bi,K,Na)TiO₃ relaxor single crystals

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Abstract

This report discloses the electro-optic (EO) properties of a lead-free Bi0.5(K0.33Na0.67)0.5TiO3 (33BKNT) single crystal. The 33BKNT single crystal has near zero initial birefringence at room temperature and is optically isotropic. Moreover, the temperature dependence of the crystal’s dielectric permittivity reveals its relaxor behavior. The 33BKNT single crystal shows a quadratic EO effect with an EO coefficient (Kerr coefficient) of 16 × 10−17 m2/V2, which is higher than the Kerr coefficient in other lead-free EO materials at room temperature.

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