ゾル-ゲル法により作製したα-Fe_2O_3薄膜の三次非線形光学感受率

概要

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Third-order nonlinear optical susceptibility, x^<(3)>, of the sol-gel derived α-Fe_2O_3 thin film has been evaluated by the third-harmonic generation (THG) method. x^<(3)> of α-Al_2O_3 single crystal (112^^-0) with the same corundum structure as α-Fe_2O_3 has also been determined. The x^<(3)> of the α-Fe_2O_3 film was 5.8×10^<-11> esu, which is comparable with those of organic materials with high nonlinearity. The large x^<(3)> value of the α-Fe_2O_3 film may be ascribed to the high refractive index of 3.00 and to the three-photon resonance as well. The x^<(3)> of α-Al_2O_3 single crystal was 2.9×10^<-14> esu, which is three orders of magnitude lower than that of α-Fe_2O_3 film and almost the same as that of fused silica. The small x^<(3)> value of α-Al_2O_3 single crystal was attributed to the small refractive index and wide optical band gap.
社団法人日本セラミックス協会の論文
1993-01-01