利用缓冲质子源制作LiNbO3光波导:光学特性及稳定性研究

• 作 者: 曹霞 金晓峰 王治国 成丽华
• 机 构: 浙江大学光学仪器国家重点实验室,浙江大学信息与电子工程学系,同济大学物理系,浙江大学光学仪器国家重点实验室 浙江杭州310027,浙江杭州310027,上海200092,浙江杭州310027
• 出 处: 中国激光
• 发表日期: 2005年01期
• 关键词: 材料 质子交换光波导 有效折射率 稳定性 铌酸锂 苯甲酸锂

利用缓冲质子源(苯甲酸中掺入一定量的苯甲酸锂)在Z切LiNbO3基底上制作了质子交换平面光波导,得 到了不同掺杂摩尔分数(0.5%,1.0%和1.5%)的缓冲质子源质子交换波导的有效扩散系数及折射率分布。随着 质子源中苯甲酸锂的摩尔含量逐渐增加,质子交换的有效扩散系数呈指数衰减,同时波导表面折射率增量线性递 减。研究了有效折射率的稳定性特征,并与用纯苯甲酸制作的光波导进行了比较,发现利用缓冲质子源制作的 LiNbO3光波导的稳定性明显优于纯苯甲酸制作的光波导。

Proton exchange planar optical waveguides were fabricated on a Z-cut LiNbO3 substrate by using a buffered proton source (benzoic acid doped with a certain amount of lithium benzoate), and buffers with different doping mole fractions (0.5%, 1.0% and 1.5%) were obtained Effective Diffusion Coefficients and Refractive Index Distributions of Proton-Source Proton Exchange Waveguides. As the molar content of lithium benzoate in the proton source gradually increases, the effective diffusion coefficient of proton exchange decays exponentially, and the refractive index of the waveguide surface increases linearly with decreasing increment. The stability of the effective refractive index was studied. Compared with the optical waveguide made of pure benzoic acid, the stability of the LiNbO3 optical waveguide fabricated by the buffer proton source was obviously better than that of pure benzoic acid.