We report that the photorefractive response of as‐grown BaTiO3 crystals can be improved by γ irradiation from a Co60 source. An increase in photorefractive response was observed with irradiation doses exceeding 106 rad, with a maximum observed increase in two‐beam coupling gain of ∼15%. We interpret our results within the context of a well‐known model of photorefractivity in BaTiO3 and conclude that γ irradiation increases the effective trap density and possibly also increases the normalized conductivity in samples where both holes and electrons contribute to photorefractivity.

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