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Cubic boron nitride (Cbn) is a kind of artificial (synthetic) crystal. Transverse electro-optic modulation in a minute Cbn sample was carried out. Basing on the practical form of the crystal, we established the theoretical and experimental method according to the sample. For the first time, the linear electro-optic effect was observed in Cbn, and half-wave voltage of the Cbn sample was measured successfully. Furthermore, its linear electro-optic coefficient was calculated at 1.17×10-14 m/V.