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Nonlinear optical properties of heavy metal and transition metal oxides

重金属和过渡金属氧化物的非线性光学性质

基本信息

批准号：
07455266
负责人：
YOKO Toshinobu
金额：
$ 4.35万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455266/
关键词：
Nonlinear optical materials Heavy metal oxide transition metal oxide THG method Z-scan method Oxide-coating film Sol-gel method Second hyperpolarizability

项目摘要

In this research, we have investigated the nonlinear optical properties of melt-derived oxide glasses containing transition metals and sol-gel derived transition metal oxide films with and without d-electrons by means of the third harmonic generation (THG) method and Z-scan method aiming at designing novel inorganic nonlinear optical materials.First, we assembled the Z-scan optics by using the CCD detector which were purchased. Since it can detect four channel signals at the same time and at the high S/N ratio, the CCD detector made it possible to measure the reliable data in a very short time. From the THG measurements on the sol-gel derived transition metal oxide films with or without heavy metal oxides, Fe^<3+> and Pb^<2+> ions were found to have high second-order hyperpolarizabilities. Using various iron oxide, effects of oxidation states and coordination states of iron, and crystal structure on the second-order hyperpolarizability (gamma) were investigated. The higher the oxidation state (Fe^<2+> * Fe^<3+> * Fe^<4+>) and the lager the coordination number (4 * 6), the larger the second-order hyperpolarizability (gamma). Using l.9m laser light as a incident beam, a conspicuous red THG signal were observed for TiO_2 (ll0) single crystal under the phase matching condition. The effects of d- electron on the nonlinear optical properties of transition metal oxide-containing TeO2 glasses were investigated. The results were explained based on the modified bond orbital theory originally proposed by Lines.

在本研究中，我们通过三次谐波发生（THG）方法和Z扫描方法研究了含过渡金属的熔融法氧化物玻璃和含或不含d电子的溶胶凝胶法过渡金属氧化物薄膜的非线性光学性质，旨在设计新型无机非线性光学材料。首先，我们使用购买的CCD探测器组装了Z扫描光学器件。由于CCD探测器可以同时以高信噪比检测四个通道信号，因此可以在很短的时间内测量出可靠的数据。根据对含有或不含有重金属氧化物的溶胶-凝胶衍生的过渡金属氧化物膜的THG测量，发现Fe^3+和Pb^2+离子具有高的二阶超极化率。使用各种氧化铁，研究了铁的氧化态和配位态以及晶体结构对二阶超极化率（γ）的影响。氧化态（Fe^<2+> * Fe^<3+> * Fe^<4+>）越高，配位数（4 * 6）越大，二阶超极化率（gamma）越大。以l.9m激光作为入射光束，在相位匹配条件下，TiO_2(ll0)单晶观察到明显的红色THG信号。研究了d电子对含过渡金属氧化物TeO2玻璃非线性光学性能的影响。结果是基于 Lines 最初提出的修正键轨道理论来解释的。