The physical characteristics of high resistivity CdTe which are relevant to its use for electro-optic modulation have been investigated at 3.39 and 10.6 µ. The unclamped electro-optic characteristic n0^3r41 of CdTe was found to be 12 × 10^–11 m/V and the absorption coefficient is 0.006 cm^–1. Our measurements indicate that CdTe will be a very important material for electro-optic modulation in the infrared
