NTT Makes '1,000x Faster' Variable Focus Lens

A diagram showing the principle of NTT's variable focus lens that uses KTN (potassium tantalate niobate), a kind of

A diagram showing the principle of NTT's variable focus lens that uses KTN (potassium tantalate niobate), a kind of "electro-optic crystals," whose refractive indices change depending on applied voltage

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