窄线宽可调谐紫光和紫外激光的实现对于碱金属原子里德堡激发、碱土金属原子和离子等的激光冷却与操控具有重要意义，也是激光技术和非线性光学的重要发展方向。碱金属原子的里德堡激发在量子光学、量子信息方面有重要前景；而碱土金属原子和离子等在高稳定度光晶格原子光钟、离子光钟和量子光学、量子信息方面也有重要研究价值。结合我们研究组已有的工作基础和积累，充分利用激光技术领域发展迅速的光纤放大器、光纤激光器等和准位相匹配频率转换材料和技术，针对铯原子6S_1/2-85P_3/2单光子跃迁里德堡激发所需的318.6nm窄线宽可调谐紫外激光实验实现，拟开展以下几方面的研究：1)10W级1560nm和1077nm可调谐窄线宽激光的实现及特性研究；2)经高效和频过程实现瓦级637.2nm窄线宽激光输出；3)637.2nm激光频率调谐与频率稳定；4)通过腔增强倍频实现318.6nm紫外激光输出；5)尝试探索铯原子单光子跃迁里德堡激发过程。

Realization of frequancy-tunable narrow-linewidth violet and ultraviolet lasers is of great significance in Rydberg excitation of alkali metal atoms,laser cooling and manipulation of alkaline earth metal atoms and ions, and it is also a very important direction of developments in laser technology and nonlinear optics. Rydberg excitation of alkali metal atoms has great prospect in quantum optics and quantum information; Alkaline earth metal atoms and ions can be employed especially in the high-stability optical lattice atomic clock, single-ion optical clock, and other realms in quantum optics and quantum information. With the basis of our previous works and accumulations, adoping the quickly-developed laser technology such as fiber amplifier, narrow-linewidth fiber laser and quasi-phase-matched nonlinear frequency conversion materials, we aim to study many aspects of key techniques and to realize the 318.6nm the narrow-linewidth and tunable ultraviolet laser device for cesium Rydberg excitation using one-step single-photon transition. The research aspects are following: 1) Achievement and characterization of the 10W-level narrow-linewidth and tunable lasers at 1560nm and 1077nm; 2) Efficient sum-frequency generation to obtain the Watt-level narrow-linewidth 637.2nm laser output; 3) Frequency tunibility and stabilization of the 637.2nm laser; 4) Cavity-enhanced frequency doubling to achieve the 318.6nm ultraviolet laser; 5) Try to explore Rydberg excitaion of cesium atoms via single-photon transition.