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Gallium oxide was deposited on a c-plane sapphire substrate by oxygen plasma-assisted pulsed laser deposition (PLD).An oxygen radical was generated by an inductive coupled plasma source and the effect of radio frequency (RF) power on growth rate was investigated.A film grown with plasma assistance showed 2.7 times faster growth rate.X-ray diffraction and Raman spectroscopy analysis showed β-Ga2O3 films grown with plasma assistance at 500 ℃.The roughness of the films decreased when the RF power of plasma treatment increased.Transmittance of these films was at least 80％ and showed sharp absorption edge at 250 nm which was consistent with data previously reported.