Photorefractive crystals having the formula K.sub.1-y Li.sub.y Ta. sub. 1-x Nb.sub.x O.sub.3 wherein x is between 0 and 1 and y is between 0. 0001 and 0.15. The crystals are useful as a photorefractive material for use in optical systems. The crystals may be doped with various first transition elements and lanthanides including copper, vanadium, chromium, iron, and manganese, nickel, europium and cerium.
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机译：具有式K 1-y Li y Ta的光折变晶体。子1-x Nb x O 3，其中x在0和1之间，y在0. 0001和0.15之间。该晶体可用作光学系统中使用的光折变材料。晶体可以掺杂有各种第一过渡元素和镧系元素，包括铜，钒，铬，铁和锰，镍，euro和铈。
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