Photorefractive two-beam coupling measurements as a function of the orientation of the grating spacing at 514 nm have enabled us to precise the values of the electrooptic coefficients of BCT. We find rT 13 = 33pm. V-1 and rT 33 = 170pm. V-1. These values are in good accordance with other published values. For the interesting coefficient rT 42, we find a higher value rT 42 = 465pm. V-1 than the one previously published. The observation of beam-fanning and the fact that we have been able to implement a DPCM in a 45°-cut BCT (and not in a 0° cut crystal) confirms that the electrooptic coefficient rT 42 is higher than rT 33.

© 2001 Optical Society of America

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