NTT have developed a variable focus lens that they claim is 1,000x faster than existing technology. The lens is based on KTN (potassium tantalate niobate), an "electro-optic crystal" the refractive indices of which varies depending on how much voltage is applied across its surface. By adjusting the voltage, the focal length varies.
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NTT KTN lens “1,000x faster” than existing tech
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