A new method for measurements of values of individual linear electrooptic coefficients and their temperature dependencies is proposed. In the approach, both the electric-field-induced changes with temperature in the crystal birefringence and the temperature dependence of the ordinary and extraordinary indices are taken into consideration. To measure the changes in the electric-field-induced birefringence the dynamic polarimetric technique was employed (see, e.g. Ref. [1]). The method was applied for linear electrooptic coefficients r₁₁₃ and r₃₃₃ and their intrinsic counterparts. Our measurements were performed within the temperature range 25^oC - 200 ^oC for samples of stoichiometry approximately 49.3%. Contrary to the results obtained for the coefficient r₂₂₂ [2], we found r₁₁₃ and r₃₃₃ to be significantly temperature dependent. The changes in r₁₁₃ and r₃₃₃ are stronger than those obtained by interferometric means and reported for the same coefficients in Ref. [3], however, in Ref. [3] the stoichiometry of samples has not been indicated.

This work has been supported by Polish Ministry of Science and Information Society Technologies, grant no. 1 P03B 102 29.

[1] R. Ledzion, K. Bondarczuk, P. Górski and W. Kucharczyk, Cryst. Res. Technol. 34, 745, (1999).

[2] P. Górski, K. Bondarczuk and W. Kucharczyk, Opto-Electron. Rev.12, 459 (2004).

[3] J. D. Zook, D. Chen, G. N. Otto, Appl. Phys. Lett. 11, 159 (1967).

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1. Analysis of the quadratic electrooptic response of BaTiO₃ crystal in the ferroelectric phase