金引入对硫系玻璃三阶非线性及纳米结构形成影响的研究

发布时间：2018-06-26 07:27

本文选题：硫系玻璃 + 三阶非线性光学性能　；参考：《宁波大学》2015年硕士论文

【摘要】：随着信息化时代的来临,开发出超速反应的全光开关器件成为当下通信材料研究中的热点。这一器件是利用光电材料的三阶非线性光学性质,折射率在超快飞秒级激光脉冲的诱导下产生了非线性变化,进而实现光的开光操作。这种现象之中最重要的因素就是材料的三阶非线性性能,因此人们研究了各种不同的光通信材料,以求开发出具有优异三阶非线性性能的材料。硫系玻璃因其独特的光学和半导体性能而受到人们的广泛关注和研究,在大部分波段透明具有良好的化学稳定性和热稳定性、优秀的光损伤阈值、迅速的光响应时间等优点,最重要的是拥有较高的三阶非线性系数,具有十分广阔的应用前景和研究潜质。本文的目的是通过硫系玻璃的制备和测试,研究出具有较高三阶非线性系数的通信材料。早期的工作进行了一些氧化物玻璃的研究,经过测量和数据分析,虽然氧化物玻璃具有良好的机械性能,但是在均匀度和非线性方面表现不是十分理想,所以后来将工作重心转移到了硫系玻璃方面,制备出具有较高三阶非线性系数的硫系玻璃。文中描述了硫系玻璃制备过程和性能测量的方法,主要包括玻璃的热稳定性分析,吸收与透过数据分析,Z扫描的测量过程和计算,以及玻璃结构的分析方法等。制备Bi2O3-GeO2-BaO(BGB)氧化物玻璃,可知将Ba离子引入玻璃网络之后,玻璃的密度、折射率下降,拉曼散射强度图谱发生变化。通过研究拉曼散射光谱,描述出该玻璃的结构变化。制备了两组GeSbS玻璃,两组样品通过控制变量法改变组分含量,对GSS基质硫系玻璃进行研究,可知Ge-Sb和Sb2S3键对玻璃的网络结构带来了影响。制备了掺杂不同金含量的Ge25Ga10S65硫系玻璃。随着金含量的增加,样品的密度和线性折射率也随着增加。通过分析拉曼光谱,可知主要的震动来自[GeS4]四面体,金在Ge-Ga-S玻璃中是作为网络修饰体存在的。使用Z扫描方法可知,金的引入可以提高样品的三阶光学非线性性能。将金掺杂的Ge-GaS玻璃热处理之后,得到了透明的玻璃陶瓷,金作为成核剂,可以改变玻璃的结晶过程,会促进纳米晶体α-Ga2S3晶相的形成。分析可知α-Ga2S3晶相纳米颗粒有助于三阶非线性性能的提高。最后本论文进行了总结,同时指出研究的不足和需要改进的地方。
[Abstract]:With the advent of the information age, the development of overspeed all-optical switching devices has become a hot topic in the research of communication materials. This device is based on the third-order nonlinear optical properties of optoelectronic materials. The refractive index of the device is induced by ultra-fast femtosecond laser pulses and the optical operation is realized. The most important factor of this phenomenon is the third-order nonlinear properties of materials, so people have studied various kinds of optical communication materials in order to develop materials with excellent third-order nonlinear properties. Due to its unique optical and semiconductor properties, sulfur glasses have attracted extensive attention and research. Transparency in most bands has the advantages of good chemical stability and thermal stability, excellent optical damage threshold, rapid light response time and so on. The most important thing is to have high third order nonlinear coefficient, which has a very broad application prospect and research potential. The purpose of this paper is to study the communication materials with high third order nonlinear coefficient through the preparation and measurement of sulfur glasses. The early work carried out some research on oxide glass. Through measurement and data analysis, although oxide glass has good mechanical properties, it is not very good in evenness and nonlinearity. So the center of gravity was transferred to the sulfur glass, and the third order nonlinear coefficient of the sulfur glass was obtained. This paper describes the preparation process and measurement method of sulfur glass, including the thermal stability analysis of glass, the measurement process and calculation of absorption and transmission data, and the analysis method of glass structure. Bi2O3-GeO2-BaO (BGB) oxide glasses were prepared. The results show that the density, refractive index and Raman scattering intensity of the glasses decrease after Ba ions are introduced into the glass network. The structural changes of the glass were described by Raman scattering spectroscopy. Two groups of GeSbS glasses were prepared. The Ge-Sb and Sb2S3 bonds had an effect on the network structure of GSS matrix glasses. Ge25Ga10S65 sulfur glasses doped with different gold contents were prepared. With the increase of gold content, the density and linear refractive index of the sample also increase. The Raman spectra show that the main vibration comes from [GeS4] tetrahedron, and gold exists as a network modifier in Ge-Ga-S glass. The Z scan method shows that the introduction of gold can improve the third order optical nonlinearity of the sample. After heat treatment of gold-doped Ge-GaS glass, transparent glass ceramics were obtained. Gold as nucleating agent can change the crystallization process of glass and promote the formation of nanocrystalline 伪 -Ga2S3 crystal phase. The results show that 伪 -Ga _ 2S _ 3 nanocrystalline particles contribute to the improvement of third-order nonlinear properties. Finally, this paper summarizes, and points out the shortcomings of the research and the need for improvement.
【学位授予单位】：宁波大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ171.1

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