Linear Electro-optic Effect of 0.88Pb(Zn_<1/3>Nb_<2/3>)O_3-0.12PbTiO_3 Single Crystal

概要

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The linear electro-optic (E-O) coefficients of poled 0.88Pb(Zn_<1/3>Nb_<2/3>)O_3-0.12PbTiO_3 Single Crystal were characterized using an automated scanning Mach-Zehnder interferometer and the senarmont compensator method at room temperature. They were obtained at a wavelength of 632.8 nm:γ_<33>=134pm/V, γ_<13>=7pm/v, γ_<51>=462pm/V, and γ_c=131pm/V respectively and the refractive indices:n_e=2.57 and n_o=2.46. The large γ_<51> coefficient compared with γ_<33> is caused by the high dielectric constant at perpendicular to the polar-axis compared with the dielectric constant along the c-axis. Comparison with the quadratic E-O coefficients measured at near and above the Curie temperature suggests that the values of the quadratic E-O coefficients measured earlier may be smaller than the intrinsic ones due to the influence of micro-polar regions. The development of an automated scanning Mach-Zehnder interferometer, which is less susceptible to the errors caused by the laser intensity fluctuation and drafting in the optical path length in the system, is also described.
社団法人応用物理学会の論文
2000-01-15