Electro-optical and nonlinear optical properties of thin film materials containing oxygen-octahedra under high DC electric field

Field-induced birefringence measurements of (Pb,La)(Zr,Ti)O/sub 3/ thin-film material showed that the birefringence shift does not obey linear or quadratic field dependence when a large DC electric field is applied. To interpret the electrooptical and nonlinear optical properties of the material under a high DC field, a generalized anharmonic model is proposed. The Hamiltonian of a simplified oxygen-octahedra is solved. The resultant two-parameter formula was used to fit the experimental data of the field-induced birefringence for several materials.<
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