~2.0µm激光光源具有非常重要的学术和应用价值。大容量高速通讯、特种气体探测、医疗等领域的发展，对低成本、多功能、小体积、小质量的~2.0µm激光光源有着特别需求。目前，~2.0µm波长附近常规半导体激光器和其他类型光源无论从器件功能、制备工艺和成本上，都无法满足宽可调范围、窄线宽、高功率、高光束质量的应用要求。本课题以硅光子多环反馈结构的GaSb基~2μm波长混合集成外腔可调谐激光器为研究对象，以宽可调范围、窄线宽、高功率、高光束质量为主要研究目标，以~2μm光放大器（SOA）与具有波长可调谐能力的硅光子芯片混合集成为研究主线，以SOA光源和硅光子芯片中多环光反馈镜与双环构成系统的游标效应为辅助展开研究。从理论和实验上阐明新型混合集成器件的高效光反馈、波长可调谐稳定输出工作机理，深入研究光增益端和光反馈调制端的互作用物理机制，探索混合集成器件的新物理效应和理论。

~2.0μm laser source has very important academic and application value. The development of high-capacity high-speed communication, special gas detection, medical and other fields have a special demand for low-cost, multi-functional, small-volume, small-quality of ~2.0μm laser. At present, semiconductor lasers and other types of light sources near ~2.0μm from the function，preparation process and cost, application requirements of device can not meet the wide adjustable range, narrow spectral line width, high power, high beam quality, and low cost. In this project, the GaSb-based ~2μm wavelength hybrid integrated external cavity tunable laser with silicon photonic multi-loop feedback structure is studied. The main research objectives are wide adjustable range, narrow line width, high power, and high beam quality . The ~2μm optical amplifier (SOA) and the silicon photonic chip with wavelength tunability are hybrid integrated is the research main line. The vernier effect of the multi-ring optical feedback mirror and the double-ring system, SOA and silicon photonic chip is used as the auxiliary research. Theoretically and experimentally, the high-efficiency optical feedback and wavelength tunable stable output operating mechanism of the new hybrid integrated device are clarified. The interaction mechanism between the optical gain section and the optical feedback modulation section is studied carefully, and the new physical effects and theory of the hybrid integrated device are explored.