Nonlinear optical properties of CdI/sub 2/ single crystals, doped with 3D-metals iodides

O. Yurchenko, I. Olekseyuk
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Abstract

Wide band gap layered single crystals CdI/sub 2/ (4H) have close-packed hexagonal lattice. Doped with CuI and NiI/sub 2/ crystals for investigations were grown from the melt by the Bridgman method. The layered crystals possess surfaces of high quality (mirror-like quality), which are parallel to the layers. Doping improves nonlinear properties of crystals CdI/sub 2/; in particular increases the efficiency of generation of the second harmonic (SHG). SHG temperature dependencies in NiI/sub 2/ and CuI-doped crystals are investigated. All studied samples were pre-treated in magnetic fields at 4.2 K for 4 hrs. SHG signal decreases with temperature. Thus the ordering in impurity atom location is accompanied by the appearance of polarization charges on crystals surface and by increased lattice eccentricity.
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三维金属碘化物掺杂CdI/sub - 2/单晶的非线性光学性质
宽带隙层状单晶CdI/sub 2/ (4H)具有紧密排列的六方晶格。用Bridgman方法从熔体中生长出掺杂了CuI和NiI/sub 2/的晶体。层状晶体具有高质量的表面(像镜子一样的质量),它与层平行。掺杂改善CdI/ sub2 /晶体非线性性能特别是提高了二次谐波(SHG)的产生效率。研究了NiI/ sub2 /和cui掺杂晶体中SHG温度的依赖性。所有研究样品在4.2 K的磁场中预处理4小时。SHG信号随温度的升高而减小。因此,杂质原子位置的排序伴随着晶体表面极化电荷的出现和晶格偏心率的增加。
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