掩埋式光波导功分器折射率分布

Refractive Index Distribution of Buried Optical Waveguide

用两步离子交换法制备的Tl+-Na+离子交换玻璃波导,比Ag+,Li+,K+等离子制备的光波导更具优越性,避免了这些离子的不足之处,其折射率差可达0.26。在温度低于玻璃转变温度时,这些波导具有良好的热稳定性。Tl+-Na+离子半径巨大差异而产生的应力,离子的极化以及克分子体积导致了折射率的变化。本实验用雅敏干涉仪来测量实验所得的折射率分布,本文详细描述了Tl+-Na+进行离子交换来制作光波导的实验过程,并通过布格尔定律和激光特性得到光波导的折射率理论分布。最后,根据实验所得数据,以及对折射率分布有影响因素的研究,很好地解释了折射率分布的实验结果,提出的离子交换机理可很好地解释折射率分布。

A new Tl^＋ -Na^＋ buried optical waveguide fabricated the waveguide fabricated by other ions, such as Ag^＋ , Li^＋ , K^ ＋ through two-step ion-exchange in glass, is superior to , and so on. The An of refractive index of Tl^＋ -Na^＋ waveguide can reach as much as 0.26. When temperature is lower than the turning temperature of glass, these waveguides have good thermal stability. Ionic polarizability, volume as well as stresses created by the huge difference in Tl^＋ -Na^＋ ionic radii leads to the change of refractive index. In this experiment, we use Yamin interferometer to measure the refractive index. It describes in details the experiment about Tl^＋ -Na^＋ buried waveguide, and acquires the refractive index theoretical distribution according to the Bragg law and laser features. Based on the data obtained through experiment and factors affecting the distribution of refractive index, we can very well interpret the experiments and refractive index distribution by means of ion-exchange principle. The refractive index distribution can also be explained by ion-exchange principle proposed.