The beam coupling and response time of reduced BaTiO3 are reported. Th
e major carrier changes from hole to electron after reduction. The ele
ctro-optic gain and effective trap density increase with the illuminat
ion intensity. Although the electro-optic gain varies little, the resp
onse time tau decreases by a factor of 2.8 after reduction. Experiment
al results indicate that at least three energy levels including shallo
w level(s) exist in this BaTi0(3).