蓝宝石包层铒激活CNGS晶体平面波导结构的一体化生长研究

平面波导激光器是高功率、高亮度全固态激光和系统小型化发展的重要方向之一，如何设计并制备高性能的平面波导增益介质是推进相关激光器件应用的关键科学问题。本项目以Er3+,Yb3+:Ca3NbGa3Si2O14（CNGS）晶体为研究对象，根据其生长习性，采用蓝宝石沟槽作为模板，开展模板限域辅助CNGS激光晶体的定向生长研究，并充分利用该晶体与蓝宝石相匹配的晶格周期以及热膨胀特性，直接制备蓝宝石平面包层激光晶体的一体化结构。通过系统设计和调整模板结构尺寸，优化生长工艺参数，获得较大尺寸的蓝宝石包层平面波导。进而表征其微观结构组成、光学性能以及波导边界层完整性，揭示波导结构尺寸与导波特性之间的关联性规律。项目的实施将拓展出一类新型的平面波导制备方法，并为此类材料在高性能1.5μm波段平面波导固体激光器方面的开发和应用奠定基础。

Planar waveguide lasers are one of the most important directions for the development of high-power, high-brightness all-solid-state lasers and system miniaturization. How to design and prepare high-performance planar waveguide gain media is a key scientific issue to promote the application of related laser devices. This project takes Er3+, Yb3+:Ca3NbGa3Si2O14 (CNGS) crystal as the research object, based on its growth habit, the sapphire groove is used as a template to carry out the study on the template-assisted directional growth of the CNGS laser crystal , and by making full use of the matched lattice period and thermal expansion characteristics between this crystal and sapphire, an integrated structure of sapphire planar cladding laser crystal can be directly prepared. By systematically designing and adjusting the size of the template structure, optimizing the growth process parameters, a larger size sapphire-clad planar waveguide can be obtained. Then we will characterize the microstructure composition, optical performance and integrity of the waveguide boundary layer, and reveal the law of correlation between the size of the waveguide structure and the characteristics of waveguiding. The implementation of this project will expand a new type of planar waveguide preparation method and lay the foundation for the development and application of this material in the high-performance 1.5μm band planar waveguide solid-state laser.