Influence of the rare-earth doping on the photoinduced EOEs in the GdCOB

We have discovered a photoinduced linear electrooptic effect (EOE) in the GdCOB doped by the rare-earth ions of the Tm3+ and Sm3+. We have found that doping by Tm3+ is essentially more efficient for increasing EOE compared with the Sm3+ ones. Moreover, increasing Sm3+ content diminishes the values of the r23 electrooptics coefficient. For comparison, the corresponding values for the pure GdCOB are nonsensitive to UV-pumping power and maximal EOE is less than 0.3 pm/V. [Copyright &y& Elsevier]