Abstract
The photorefractive BGO crystal shows rapid respond (second level) when applied by external electric field, but it has weak photorefractive effect. CeO<sub>2</sub> and CuO co-doped BGO (Bi<sub>12</sub>GeO<sub>20</sub>) crystal has been grown by Czochralski method for the first time. The diffraction efficiency and respond time of Ce:Cu:BGO and BGO crystals are determined with two-wave-coupling technology. The phase conjugate reflectivity and respond time are also determined in four-wave-fixing optical path. The results indicate that diffraction efficiency and phase conjugate reflectivity of Ce:Cu:BGO is 30% higher than those of non-doped BGO and the response time exhibits in second level with 6kv/cm<sup>2</sup> external electric field. The improvement mechanism of photorefractive effect of Ce:Cu:BGO crystal is investigated systematically.
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