Second-harmonic generation in highly textured LiNbO3 films prepared by pulsed laser deposition
Second-harmonic generation in highly textured LiNbO3 films prepared by pulsed laser deposition
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DOI：
10.1063/1.1289070
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发表时间：
2000-08
影响因子：
3.2
通讯作者：
J. A. Chaos;V. Pruneri;J. Gonzalo;C. Afonso
中科院分区：
文献类型：
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作者：
J. A. Chaos;V. Pruneri;J. Gonzalo;C. Afonso
采用脉冲激光沉积法在（001）蓝宝石衬底上制备了LiNbO 3薄膜。在650 °C的衬底温度下生长的膜是结晶的、强烈纹理化的，并且显示出一定程度的缠绕，该缠绕程度在0.5-1托的范围内的氧压越高越低。通过二次谐波产生测量的薄膜的非线性光学系数d33和d31的值接近于大块LiNbO 3单晶的值。薄膜的非线性光学响应和孪晶度与薄膜厚度的关系表明，薄膜厚度越大，其非线性光学响应越接近单畴。
LiNbO3 films have been deposited on (001) sapphire substrates by pulsed laser deposition, in an oxygen environment. Films grown at substrate temperatures of 650 °C are crystalline, strongly textured, and show a degree of twining that is lower the higher the oxygen pressure is in the range of 0.5–1 Torr. Values of the nonlinear optical coefficients d33 and d31 of the films, measured via second-harmonic generation, are close to those for the bulk LiNbO3 single crystal. The dependence of both the degree of twining and the nonlinear optical response on the film thickness suggests that the films become closer to single domain for larger thickness.