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Formation of Periodic Structure in Glasses using Thermal Poring and Laser Irradiation for Optical Applications

使用热孔和激光照射在光学应用中形成玻璃周期性结构

基本信息

批准号：
14550725
负责人：
TAKEBE Hiromichi
金额：
$ 2.3万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

Effect of thermal poling conditions on second harmonic generation in fused quartz was studied. The roles of minority species such as oxygen point defects, Na^+ and H^+ were considered and the thickness of second-order nonlinear active layer, dc current during poling process, microstructure using transmission electron microscopy were evaluated. Glass forming region, physical properties and structure of vitreous RS-Ga_2S_3 (R=Ca,Sr,Ba) were studied as a new sulfide glass system. Effects of GeS_2 and B_2O_3 additions on the thermal properties and structure of BaS-Ga_2S_3-GeS_2 and BaO-P_2O_5-B_2O_3 glass systems were also studied, respectively. New glass compositions which can draw into fiber forms without crystallization were found in these systems for fiber optics. Microlens formation, as induced by single shot of a femtosecond laser pulse, was observed in Sm-doped non-crystalline SrS-Ga_2S_3 thin films. The metallic- to semiconductor-phase transition was induced in metallic SmS thin films by a generatively amplified mode-locked Ti : sapphire laser. From the point of Ag photo-doping behavior, Ge-S,Ge-Sb-S and Ga_2S_3 sulfide glasses can be classified into 2 groups : (1)covalent glasses containing S-S bonds and point defects (e.g., S-rich Ge-S and Ge-Sb-S glasses) and (2)ionic glasses containing modifier ions such as Ge^<2+>,Ba^<2+> and La^<3+> (e.g., Ge_<40>S_<60> and Ga_2S_3 glasses). The former glasses only show Ag photo-doping and are appropriate for structural modification by light for planar waveguide and photonic crystal formations. The latter glasses with relatively-good stability against laser irradiation may be suitable for relatively-high power applications as IR fiber lasers and amplifiers.

研究了热极化条件对熔融石英中二次谐波产生的影响。考虑了氧点缺陷、Na~+、H~+等少数物种的作用，分析了二阶非线性有源层的厚度、极化过程中的直流电流以及用透射电子显微镜观察到的微观结构。研究了一种新的硫化物玻璃体系RS-Ga2S3(R=Ca，Sr，Ba)的玻璃形成范围、物理性质和结构。研究了GeS_2和B_2O_3的添加对BaS-Ga_2S_3-GeS_2和BaO-P_2O_5-B_2O_3系统玻璃热性能和结构的影响。在这些光纤光学系统中发现了新的玻璃成分，它们可以在不析晶的情况下拉伸成纤维形状。在Sm掺杂的非晶态SrS-Ga2S3薄膜中观察到了单次飞秒激光脉冲诱导的微透镜的形成。利用产生放大锁模钛宝石激光在金属Sm薄膜中诱导了金属-半导体相变。从银光掺杂行为来看，Ge-S、Ge-Sb-S和Ga_2S_3硫化物玻璃可分为两类：(1)含S-S键和点缺陷的共价玻璃(如富S的Ge-S和Ge-Sb-S玻璃)和(2)含改质离子的离子玻璃，如Ge^&lt；2+&gt；Ba^&lt；2+&gt；和Ga_2S_3玻璃)。以前的玻璃只显示银光掺杂，适合于平面波导和光子晶体的光结构修饰。后者具有较好的抗激光辐照稳定性，可能适合于红外光纤激光器和放大器等相对高功率的应用。