Abstract
We have measured the low frequency (undamped) electrooptic and piezoelectric coefficients in several photorefractive crystals using interferometric techniques. The electrooptic and piezoelectric measurements were independent of the frequency (in the range from 10 Hz to 100 kHz) and linear in the magnitude (in the range from 0.1 to 200 V/cm) of the applied electric field. The electrooptic coefficients measured in melt-grown BaTiO3 single crystals at λ = 5145 Å and at T = 23°C are r13 = 33 ± 2 pm/V and r33=124 ± 6 pm/V. The piezoelectric coefficient d13 = 57 ± 3 pm/V was measured separately. The combined Pockels coefficient rC = 84 ± 5 pm/V was measured independently and is in good agreement with the value rc ≡ r33 − (n1/n3)3r13 = 84 ± 5 pm/V computed from the above values of r13 and r33. (n1, and n3 are the ordinary and extraordinary indices of refraction, respectively, of tetragonal BaTiO3.) Similar measurements at λ = 5145 Å in Sr0.6Ba0.4Nb2O6 single crystals yield the electrooptic coefficients r13 = 55 ± 3 pm/V, r33 = 224 ± 11 pm/V, and the piezoelectric coefficient d13 = 47 ± 3 pm/V. The electrooptic and piezoelectric coefficients of LiNbO3 single crystals were also measured. As an independent check on this data, we also measured the coupling between two optical beams in these photorefractive crystals. The ratio of the measured coupling strengths for different optical polarizations agrees with theory using the electrooptic coefficients measured above.
© 1986 Optical Society of America
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