钠导星技术对天文学和国防事业的发展具有重要的推动作用。钠导星技术要求连续黄光激光器的平均功率不低于10W，且单频运转，并能精确匹配渡越线。目前589nm全固态拉曼激光器主要通过Nd:YAG等激光晶体结合拉曼转换获得1178nm，然后倍频实现。相比于利用全固态激光器作为拉曼光的泵浦源，通过LD直接泵浦的方式可减少中间转换过程，提高效率。本项目开展蓝光LD直接泵浦Pr:LiNbO3的自拉曼钠黄光激光器研究，Pr3+在546nm处具有高的发射峰，再结合LiNbO3基质的非线性特性，经级联斯托克斯获得585nm黄光输出，再利用标准具实现宽范围调谐的单纵模589.16nm精确输出。该方法可以克服多个晶体元件带来的级联泵浦转换的能量损失，提升全固态钠黄光激光器的整体电光效率和功率水平，对推动自适应光学系统和天文学领域的发展具有重要的意义和实用价值。

Sodium-guided laser technology is extremely important for the development of astronomy and national defense. The sodium guide star technology requires that the average power should be no less than 10 W for the continuous-wave yellow laser which having narrow-linewidth and are capable of being tuned to match transition lines accurately. According to literatures at home and abroad, for the 589.16 nm guide star wavelength, the 1064 nm Nd:YAG fundamental transition and the Raman shift to 1178 nm and frequency doubling process have been used. Compared to the all-solid-state laser as a pump source for Raman light, the method of LD-pumping reduces the intermediate conversion process and improves efficiency. This project proposes an exploratory study of blue LD-pumped Pr:LiNbO3 self-Raman sodium yellow laser. Considering of the high emission peak at 546 nm of Pr3+ and the nonlinear characteristics of the LiNbO3 matrix, we can achieve 585 nm yellow light after cascade stoke process, which is then calibrated to achieve single longitudinal mode 589.16 nm yellow laser output by using an etalon. Once the research makes a breakthrough, it can overcome the energy loss of cascade pumping caused by multiple crystal components, and significantly improve the power level and electro-optic efficiency of all-solid sodium yellow laser. At last, it will promote the rapid development of adaptive optics and astronomy.