Abstract

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 ${\text{r}}_{13}^{\text{T}}$ = 33pm. V⁻¹ and ${\text{r}}_{33}^{\text{T}}$= 170pm. V⁻¹. These values are in good accordance with other published values. For the interesting coefficient ${\text{r}}_{42}^{\text{T}}$, we find a higher value ${\text{r}}_{42}^{\text{T}}$ = 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 ${\text{r}}_{42}^{\text{T}}$ is higher than ${\text{r}}_{33}^{\text{T}}$.

© 2001 Optical Society of America