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Analysis of quadratic electrooptic response of BaTiO₃ crystal in ferroelectric phase

Izdebski M., Kucharczyk W.

Opto-Electronics Review

2008

Vol. 16, No. 1

42-45

Using the example of BaTiO₃ in a ferroelectric phase it is shown that a large difference in magnitudes of individual linear electrooptic coefficients may be a reason of additional indirect quadratic contributions that are independent of real quadratic coefficients. For some directions of the applied field and light, the indirect contributions may be even larger than the real quadratic ones. Independently of nonlinear distortions that can affect applicability of technical devices, a large difference between linear electrooptic coefficients may lead to serious problems in measurements of the real quadratic electrooptic effect. The analysis is based on the extended Jones matrix calculus applied to a Gaussian beam.

Measurement conditions of the quadratic electrooptic coefficients along the optic axis in uniaxial crystals

Izdebski M., Kucharczyk W.

Optica Applicata

2003

Vol. 33, nr 1

213-218

Following our previous discussions of measurement accuracy of electrooptic coefficients in uniaxial crystals the light wave propagation along the optic axis of ammonium dihydrogen phosphate (ADP) in a field that bisects the X and Y crystallographic axes is considered. We analyse the effect of imperfection in crystal cutting and alignment by means of computer analysis based on the Jones calculus. It is confirmed that, for relatively small inaccuracies, the values of the quadratic electrooptic coefficients can be significantly larger when measured with a static field than those measured with a sinusoidal one.