用于自适应光学的钠导星激光器研究进展

Research progress of sodium guide star laser for adaptive optics

自适应光学技术在大型地基光学天文望远镜发展中扮演越来越重要的角色,589 nm钠导星激光器是此技术的关键。按产生方式的不同,综述了染料钠导星激光器、全固态钠导星激光器和光纤钠导星激光器,重点从激光产生难度与导星回波效率等方面对不同运转模式的全固态钠导星激光器进行了比较与分析。与连续波运转的钠导星光源相比,以微秒脉冲方式运转的钠导星光源可以采用时间选通机制提高钠导星成像精度,为自适应光学的校正提供了优良的信标。

Adaptive optics technology plays an increasingly important role in the development of large ground-based optical astronomical telescopes, whereas the 589 nm sodium guiding star laser （SGSL） is the key to this technology. According to different generation ways, this paper reviews dye SGSL, all solid state SGSL and optical fiber SGSL, with emphases on analysis and comparison of all solid state SGSLs operating in different modes in terms of laser generation and photon-return efficiency of laser guide star. Compared ~th continuous wave SGSL, SGSL operating in microseeond pulse mode can use time gating mechanism to improve the imaging accuracy of sodium guide star, which provides an excellent beacon for adaptive optics correction,